(CNN) -- At 2:50 p.m. Monday, bells across Boston will chime to mark a tragedy that unhinged the city.
As the country pauses to reflect on the Boston Marathon attacks exactly one week ago, the lone surviving suspect remains hospitalized with a tube down his throat, unable to verbalize what went through his mind the day a pair of bombs killed three people and wounded more than 170 others.
While authorities say Bostonians can rest easier now that Dzhokhar Tsarnaev is in custody, a nagging question hinders any complete sense of security: Why would the assailants want to kill and maim throngs of innocent civilians?
Police chief: The carnage could have been worse
In the tumultuous days since the bombings, Tsarnaev and his older brother Tamerlan killed a university police officer, led authorities on a harrowing chase and hurled explosives at police, authorities said.
Commissioner gives insight to arrest 
The week that changed Boston forever 
Bombing suspect's classmates speak 
Marathoner dedicates London win to Boston Tamerlan Tsarnaev died after an epic gun battle with officers in which more than 200 rounds were exchanged. Dzhokhar Tsarnaev was found less than a day later, hiding in a boat and bleeding in a Watertown man's backyard.
Politics finds way into post-bombing debate
Boston Police Commissioner Ed Davis said he believed the brothers were planning another attack before the shootout with police disrupted their plans.
"We have reason to believe, based upon the evidence that was found at the scene -- the explosions, the explosive ordnance that was unexploded and the firepower -- that they were going to attack other individuals," Davis said Sunday on CBS News' "Face the Nation."
He did not say whether investigators had identified a specific target.
Authorities believe the brothers bought bomb components locally but their guns came from elsewhere, another federal law enforcement official said. The official, who was not authorized to publicly discuss the case, said authorities are trying to trace the guns.
Investigators are also trying to determine whether anyone else was behind the bombings.
But Davis told CNN's Don Lemon that he was confident that the brothers were "the two major actors in the violence that occurred."
"I told the people of Boston that they can rest easily, that the two people who were committing these vicious attacks are either dead or arrested, and I still believe that," the police chief said Sunday.
Clues of radicalization?
While investigators piece together the brothers' actions in the months and days before the marathon bombings, details have emerged suggesting the elder Tsarnaev was becoming radical.
The Tsarnaev family hails from the Russian republic of Chechnya and fled the brutal wars there in the 1990s. The two brothers were born in Kyrgyzstan, authorities said.
Opinion: Don't blame immigration for bombings
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Boston bombing suspect Dzhokhar Tsarnaev is detained by officers on Friday, April 19. After a car chase and shootout with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, was shot and killed by police early Friday, and his brother and second suspect, Dzhokhar Tsarnaev, was taken into custody Friday night. The two men are suspects in the bombings at the Boston Marathon on April 15, that killed three people and wounded at least 170. See all photography related to the Boston bombings. Special imaging techniques employed by Massachusetts State Police reveal Boston Marathon bombing suspect Dzhokhar Tsarnaev hiding in a boat in a backyard in Watertown on April 19. Dzhokhar Tsarnaev gets out of the boat he was hiding in outside of a home in Watertown, as seen in a surveillance video still. An ambulance carries Boston Marathon bombing suspect Dzhokhar Tsarnaev, 19, from the scene after he was apprehended in Watertown, Massachusetts, on April 19. Police SWAT teams leave the area after apprehending the suspect in a yard where he was hiding in a dry-docked boat on April 19. Residents flee from an area where a suspect was hiding on Franklin Street on April 19. SWAT team members run toward a police assault on a house as gunfire erupts on April 19. People react while watching police respond to reported gunfire on April 19. SWAT team members move down residential streets as they perform door-to-door searches in Watertown, Massachusetts, on April 19. A U.S. military helicopter lands behind Watertown Mall as law enforcement agencies continue to search for the 19-year-old bombing suspect on Friday. SWAT teams prepare to enter a home as they continue the door-to-door search. U.S. President Barack Obama meets with members of his national security team in the Situation Room of the White House on April 19 to discuss developments in the Boston bombings investigation. SWAT team members line a residential street in Watertown, Massachusetts, as the manhunt continues on Friday. A man watches from the window of a home as a SWAT team member keeps watch on Friday, in Watertown, Massachusetts. Police to continue to the door-to-door search on Francis Street in Watertown, Massachusetts, on Friday. Law enforcement officers place themselves in an overhead position on Arsenal Street as the search continues on April 19. Law enforcement officers react to what was initially thought to be a threatening suspect on Arsenal Street on April 19. A police SWAT team searches houses on April 19 for the second suspect. SWAT teams searches homes along Winsor Avenue in Watertown on April 19. A Massachusetts state trooper watches other troopers line up at Watertown Mall as the manhunt for the second suspect continues in Watertown on Friday. Police continue the ongoing manhunt for the second suspect on Williow Avenue in Watertown on Friday. A Watertown police vehicle with bullet holes in its body and a shattered windshield is towed out of the search area on April 19 in Watertown, Massachusetts. A Massachusetts State Police officer checks the bag of a cyclist amid heightened security on Friday in Watertown. Katia Costa looks out her window as police continue the manhunt on Nichols Avenue in Watertown on Friday. Ruslan Tsarni, uncle of the Boston terror suspects, told CNN affiliate WBZ that Tamerlan "got what he deserved" in an interview outside his home in Montgomery Village, Maryland, on Friday. A woman is questioned by Cambridge police and other law enforcement agencies Friday near the home of the second suspect in Cambridge, Massachusetts. A Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in nearby Watertown. SWAT teams move into position at the intersection of Nichols and Melendy avenues in Watertown, Massachusetts, on Friday. SWAT teams gather at the intersection of Nichols and Melendy avenues in Watertown while searching for the remaining suspect on Friday. Onlookers take pictures while SWAT team members look around on Friday. Massachusetts Gov. Deval Patrick, left, speaks to the media at a shopping mall on the perimeter of a locked-down area during the search on Friday. Metro SWAT members hang off the back of a truck during the search on Friday. SWAT officers check a door with guns ready on Friday. Officers patrol Watertown on Friday. The aftermath of the shootout that police said involved the two suspects in Watertown early Friday. Police with guns drawn search for a suspect on Friday in Watertown, Massachusetts. A police officer runs with his gun drawn on Friday. Boston Police gather in the parking lot in front of a Best Buy store near the Watertown Mall on Friday. Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on Friday. Boston police gather in front of a Best Buy on Friday. Police stop cars at School and Walnut streets on Friday. A Massachusetts state trooper checks a building along Mount Auburn Street as police search neighborhoods in Watertown. Police search neighborhoods yard by yard on Friday. Police convene on School and Walnut streets on Friday. A police officer talks to a driver at a checkpoint in Watertown, Massachusetts. Police officers keep a man on the ground in Watertown on Friday. See all photography related to the Boston bombings. 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Special imaging techniques employed by Massachusetts State Police reveal Boston Marathon bombing suspect Dzhokhar Tsarnaev hiding in a boat in a backyard in Watertown on April 19. 
Dzhokhar Tsarnaev gets out of the boat he was hiding in outside of a home in Watertown, as seen in a surveillance video still. 
An ambulance carries Boston Marathon bombing suspect Dzhokhar Tsarnaev, 19, from the scene after he was apprehended in Watertown, Massachusetts, on April 19. 
Police SWAT teams leave the area after apprehending the suspect in a yard where he was hiding in a dry-docked boat on April 19. 
Residents flee from an area where a suspect was hiding on Franklin Street on April 19. 
SWAT team members run toward a police assault on a house as gunfire erupts on April 19. 
People react while watching police respond to reported gunfire on April 19. 
SWAT team members move down residential streets as they perform door-to-door searches in Watertown, Massachusetts, on April 19. 
A U.S. military helicopter lands behind Watertown Mall as law enforcement agencies continue to search for the 19-year-old bombing suspect on Friday. 
SWAT teams prepare to enter a home as they continue the door-to-door search. 
U.S. President Barack Obama meets with members of his national security team in the Situation Room of the White House on April 19 to discuss developments in the Boston bombings investigation. 
SWAT team members line a residential street in Watertown, Massachusetts, as the manhunt continues on Friday. 
A man watches from the window of a home as a SWAT team member keeps watch on Friday, in Watertown, Massachusetts. 
Police to continue to the door-to-door search on Francis Street in Watertown, Massachusetts, on Friday. 
Law enforcement officers place themselves in an overhead position on Arsenal Street as the search continues on April 19. 
Law enforcement officers react to what was initially thought to be a threatening suspect on Arsenal Street on April 19. 
A police SWAT team searches houses on April 19 for the second suspect. 
SWAT teams searches homes along Winsor Avenue in Watertown on April 19. 
A Massachusetts state trooper watches other troopers line up at Watertown Mall as the manhunt for the second suspect continues in Watertown on Friday. 
Police continue the ongoing manhunt for the second suspect on Williow Avenue in Watertown on Friday. 
A Watertown police vehicle with bullet holes in its body and a shattered windshield is towed out of the search area on April 19 in Watertown, Massachusetts. 
A Massachusetts State Police officer checks the bag of a cyclist amid heightened security on Friday in Watertown. 
Katia Costa looks out her window as police continue the manhunt on Nichols Avenue in Watertown on Friday. 
Ruslan Tsarni, uncle of the Boston terror suspects, told CNN affiliate WBZ that Tamerlan "got what he deserved" in an interview outside his home in Montgomery Village, Maryland, on Friday. 
A woman is questioned by Cambridge police and other law enforcement agencies Friday near the home of the second suspect in Cambridge, Massachusetts. A Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in nearby Watertown. 
SWAT teams move into position at the intersection of Nichols and Melendy avenues in Watertown, Massachusetts, on Friday. 
SWAT teams gather at the intersection of Nichols and Melendy avenues in Watertown while searching for the remaining suspect on Friday. 
Onlookers take pictures while SWAT team members look around on Friday. 
Massachusetts Gov. Deval Patrick, left, speaks to the media at a shopping mall on the perimeter of a locked-down area during the search on Friday. 
Metro SWAT members hang off the back of a truck during the search on Friday. 
SWAT officers check a door with guns ready on Friday. 
Officers patrol Watertown on Friday. 
The aftermath of the shootout that police said involved the two suspects in Watertown early Friday. 
Police with guns drawn search for a suspect on Friday in Watertown, Massachusetts. 
A police officer runs with his gun drawn on Friday. 
Boston Police gather in the parking lot in front of a Best Buy store near the Watertown Mall on Friday. 
Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on Friday. 
Boston police gather in front of a Best Buy on Friday. 
Police stop cars at School and Walnut streets on Friday. 
A Massachusetts state trooper checks a building along Mount Auburn Street as police search neighborhoods in Watertown. 
Police search neighborhoods yard by yard on Friday. 
Police convene on School and Walnut streets on Friday. 
A police officer talks to a driver at a checkpoint in Watertown, Massachusetts. 
Police officers keep a man on the ground in Watertown on Friday. See all photography related to the Boston bombings. Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Photos: Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers Manhunt for Boston bombers HIDE CAPTION << < 
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45 > >> Photos: Manhunt for Boston bombers .cnnArticleGalleryNav{border:1px solid #000;cursor:pointer;float:left;height:25px;text-align:center;width:25px} .cnnArticleGalleryNavOn{background-color:#C03;border:1px solid #000;float:left;height:25px;text-align:center;width:20px} .cnnArticleGalleryNavDisabled{background-color:#222;border:1px solid #000;color:#666;float:left;height:25px;text-align:center;width:25px} .cnnArticleExpandableTarget{background-color:#000;display:none;position:absolute} .cnnArticlePhotoContainer{height:122px;width:214px} .cnnArticleBoxImage{cursor:pointer;height:122px;padding-top:0;width:214px} .cnnArticleGalleryCaptionControl{background-color:#000;color:#FFF} .cnnArticleGalleryCaptionControlText{cursor:pointer;float:right;font-size:10px;padding:3px 10px 3px 3px} .cnnArticleGalleryPhotoContainer cite{background:none repeat scroll 0 0 #000;bottom:48px;color:#FFF;height:auto;left:420px;opacity:.7;position:absolute;width:200px;padding:10px} .cnnArticleGalleryClose{background-color:#fff;display:block;text-align:right} .cnnArticleGalleryCloseButton{cursor:pointer} .cnnArticleGalleryNavPrevNext span{background-color:#444;color:#CCC;cursor:pointer;float:left;height:23px;text-align:center;width:26px;padding:4px 0 0} .cnnArticleGalleryNavPrevNextDisabled span{background-color:#444;color:#666;float:left;height:23px;text-align:center;width:25px;padding:4px 0 0} .cnnVerticalGalleryPhoto{padding-right:68px;width:270px;margin:0 auto} .cnnGalleryContainer{float:left;clear:left;margin:0 0 20px;padding:0 0 0 10px} 
Brad Marchand of the Boston Bruins embraces one of the first responders from the Boston Marathon attack after the game against the Florida Panthers at the TD Garden on Sunday, April 21, in Boston. The city is trying to return to normal after a manhunt less than a week after two bombs exploded near the finish line of the Boston Marathon, shocking the nation and leaving the city on edge. See all photography relating to the Boston bombings. David Ortiz of the Boston Red Sox speaks to the crowd during a ceremony held in honor of the bombing victims before a baseball game against the Kansas City Royals at Fenway Park in Boston, on Saturday, April 20. Neil Diamond sings "Sweet Caroline," a song traditionally played at Boston Red Sox home games, during a game against the Kansas City Royals on April 20. Members of law enforcement react during ceremonies in honor of the Marathon bombing victims before Saturday's game. A woman sheds a tear during pregame ceremonies Saturday. A man holds an American flag at ceremonies before the Saturday game in Boston. Hundreds of people pour onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement that the second Boston Marathon bombing suspect had been captured on Friday, April 19. Women cheer police as they exit Franklin Street on Friday, April 19, in Watertown, Massachusetts. Officers from the Department of Alcohol, Tobacco, Firearms and Explosives relax Friday after the capture in Watertown, Massachusetts. A woman gives a Boston police officer a hug and other officers are thanked during a celebration in the Boston Common on April 19. A member of the North Metro SWAT team pumps his fist while leaving the scene near Franklin Street on April 19. Around 200 people celebrate on Hemingway Street in the Fenway neighborhood after the capture of the second suspect on April 19. People wave U.S. flags as police drive down the street on April 19. A photograph of Martin Richard, one of the victims of the Boston Marathon bombing, was placed on the plexiglass by a fan following the hockey game between the Buffalo Sabres and the New York Rangers on April 19 at the First Niagara Center in Buffalo, New York. A man waves a U.S. flag in Watertown on April 19. Local residents cheer to news that police have captured the surviving suspect Watertown on April 19. President Barack Obama arrives in the White House briefing room to make a statement late April 19 about the capture of Dzhokhar Tsarnaev. "We've closed an important chapter in this tragedy," he said. A SWAT team member is followed by reporters and a celebrating crowd on April 19 after the successful operation. A police officer adjusts his hat while various law enforcement agencies descend on the area around Franklin Street on April 19. Spectators celebrate as law enforcement officers leave the scene on April 19 near Franklin Street. People gather at the scene near Franklin Street in Watertown on April 19. A man claps next to a police vehicle in the Watertown neighborhood on April 19. Onlookers applaud first responders departing the scene at the end of the manhunt on April 19. Police officers and SWAT team members exult after the successful operation to capture suspect Dzhokhar Tsarnaev on April 19. Boston SWAT team members are surrounded by spectators and the media on April 19. Residents clap after the capture of the second of two suspects wanted in the Boston Marathon bombings on April 19. See all photography relating to the Boston bombings. Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Photos: Boston celebrates, seeks return to normal Photos: Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal HIDE CAPTION << < 
David Ortiz of the Boston Red Sox speaks to the crowd during a ceremony held in honor of the bombing victims before a baseball game against the Kansas City Royals at Fenway Park in Boston, on Saturday, April 20. 
Neil Diamond sings "Sweet Caroline," a song traditionally played at Boston Red Sox home games, during a game against the Kansas City Royals on April 20. 
Members of law enforcement react during ceremonies in honor of the Marathon bombing victims before Saturday's game. 
A woman sheds a tear during pregame ceremonies Saturday. 
A man holds an American flag at ceremonies before the Saturday game in Boston. 
Hundreds of people pour onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement that the second Boston Marathon bombing suspect had been captured on Friday, April 19. 
Women cheer police as they exit Franklin Street on Friday, April 19, in Watertown, Massachusetts. 
Officers from the Department of Alcohol, Tobacco, Firearms and Explosives relax Friday after the capture in Watertown, Massachusetts. 
A woman gives a Boston police officer a hug and other officers are thanked during a celebration in the Boston Common on April 19. 
A member of the North Metro SWAT team pumps his fist while leaving the scene near Franklin Street on April 19. 
Around 200 people celebrate on Hemingway Street in the Fenway neighborhood after the capture of the second suspect on April 19. 
People wave U.S. flags as police drive down the street on April 19. 
A photograph of Martin Richard, one of the victims of the Boston Marathon bombing, was placed on the plexiglass by a fan following the hockey game between the Buffalo Sabres and the New York Rangers on April 19 at the First Niagara Center in Buffalo, New York. 
A man waves a U.S. flag in Watertown on April 19. 
Local residents cheer to news that police have captured the surviving suspect Watertown on April 19. 
President Barack Obama arrives in the White House briefing room to make a statement late April 19 about the capture of Dzhokhar Tsarnaev. "We've closed an important chapter in this tragedy," he said. 
A SWAT team member is followed by reporters and a celebrating crowd on April 19 after the successful operation. 
A police officer adjusts his hat while various law enforcement agencies descend on the area around Franklin Street on April 19. 
Spectators celebrate as law enforcement officers leave the scene on April 19 near Franklin Street. 
People gather at the scene near Franklin Street in Watertown on April 19. 
A man claps next to a police vehicle in the Watertown neighborhood on April 19. 
Onlookers applaud first responders departing the scene at the end of the manhunt on April 19. 
Police officers and SWAT team members exult after the successful operation to capture suspect Dzhokhar Tsarnaev on April 19. 
Boston SWAT team members are surrounded by spectators and the media on April 19. 
Residents clap after the capture of the second of two suspects wanted in the Boston Marathon bombings on April 19. See all photography relating to the Boston bombings. Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Photos: Boston celebrates, seeks return to normal Photos: Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal Boston celebrates, seeks return to normal HIDE CAPTION << < 
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26 > >> Photos: Boston celebrates .cnnArticleGalleryNav{border:1px solid #000;cursor:pointer;float:left;height:25px;text-align:center;width:25px} .cnnArticleGalleryNavOn{background-color:#C03;border:1px solid #000;float:left;height:25px;text-align:center;width:20px} .cnnArticleGalleryNavDisabled{background-color:#222;border:1px solid #000;color:#666;float:left;height:25px;text-align:center;width:25px} .cnnArticleExpandableTarget{background-color:#000;display:none;position:absolute} .cnnArticlePhotoContainer{height:122px;width:214px} .cnnArticleBoxImage{cursor:pointer;height:122px;padding-top:0;width:214px} .cnnArticleGalleryCaptionControl{background-color:#000;color:#FFF} .cnnArticleGalleryCaptionControlText{cursor:pointer;float:right;font-size:10px;padding:3px 10px 3px 3px} .cnnArticleGalleryPhotoContainer cite{background:none repeat scroll 0 0 #000;bottom:48px;color:#FFF;height:auto;left:420px;opacity:.7;position:absolute;width:200px;padding:10px} .cnnArticleGalleryClose{background-color:#fff;display:block;text-align:right} .cnnArticleGalleryCloseButton{cursor:pointer} .cnnArticleGalleryNavPrevNext span{background-color:#444;color:#CCC;cursor:pointer;float:left;height:23px;text-align:center;width:26px;padding:4px 0 0} .cnnArticleGalleryNavPrevNextDisabled span{background-color:#444;color:#666;float:left;height:23px;text-align:center;width:25px;padding:4px 0 0} .cnnVerticalGalleryPhoto{padding-right:68px;width:270px;margin:0 auto} .cnnGalleryContainer{float:left;clear:left;margin:0 0 20px;padding:0 0 0 10px} 
Massachusetts State Police released thermal images of Boston Marathon bombing suspect Dzhokhar Tsarnaev hiding in a boat in a backyard in Watertown on Friday, April 19, which helped lead to his capture. They were taken by an infrared device on a helicopter. The first image was taken at 7:19 p.m., less than 20 minutes after a homeowner told police there was a bloodied person in his dry-docked boat. See all photography related to the Boston bombings. This image from 7:22 p.m. shows a white heat signature large enough to be a person. A robotic arm tears away the cover on the boat at 7:36 p.m. The heat signature clearly shows the suspect's feet and the rest of his body behind the boat console at 8:01 p.m., minutes before he surrendered. Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. The photos were produced by the Joint Terrorism Task Force of Boston and provided to Reuters on April 16 by a U.S. government official who declined to be identified. On Wednesday morning, a federal law enforcement source with firsthand knowledge of the investigation told CNN that a lid to a pressure cooker thought to have been used in the bombings had been found on a roof of a building near the scene. One bomb was housed in a pressure cooker hidden inside a backpack, the FBI said in a joint intelligence bulletin. The device also had fragments that may have included nails, BBs and ball bearings, the FBI said. The recovered parts include part of a circuit board, which might have been used to detonate a device. A law enforcement official said Monday's bombs were probably detonated by timers. But the FBI said details of the detonating system were unknown. Scraps of at least one pressure cooker, nails and nylon bags found at the scene were sent to the FBI's national laboratory in Virginia, where technicians will try to reconstruct the devices, the agent leading the investigation said Tuesday. The U.S. government has warned federal agencies in the past that terrorists could turn pressure cookers into bombs by packing them with explosives and shrapnel and detonating them with blasting caps. The pieces suggest each of the devices was 6 liters (about 1.6 gallons) in volume, a Boston law enforcement source said. "It has the hallmarks of both domestic and international (attacks), and you can see either side of that," former FBI Assistant Director Tom Fuentes told CNN. See all photography related to the Boston bombings. Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston HIDE CAPTION << < 
This image from 7:22 p.m. shows a white heat signature large enough to be a person. 
A robotic arm tears away the cover on the boat at 7:36 p.m. 
The heat signature clearly shows the suspect's feet and the rest of his body behind the boat console at 8:01 p.m., minutes before he surrendered. 
Boston Marathon bomb scene pictures taken by investigators show the remains of an explosive device. The photos were produced by the Joint Terrorism Task Force of Boston and provided to Reuters on April 16 by a U.S. government official who declined to be identified. 
On Wednesday morning, a federal law enforcement source with firsthand knowledge of the investigation told CNN that a lid to a pressure cooker thought to have been used in the bombings had been found on a roof of a building near the scene. 
One bomb was housed in a pressure cooker hidden inside a backpack, the FBI said in a joint intelligence bulletin. 
The device also had fragments that may have included nails, BBs and ball bearings, the FBI said. 
The recovered parts include part of a circuit board, which might have been used to detonate a device. 
A law enforcement official said Monday's bombs were probably detonated by timers. But the FBI said details of the detonating system were unknown. 
Scraps of at least one pressure cooker, nails and nylon bags found at the scene were sent to the FBI's national laboratory in Virginia, where technicians will try to reconstruct the devices, the agent leading the investigation said Tuesday. 
The U.S. government has warned federal agencies in the past that terrorists could turn pressure cookers into bombs by packing them with explosives and shrapnel and detonating them with blasting caps. 
The pieces suggest each of the devices was 6 liters (about 1.6 gallons) in volume, a Boston law enforcement source said. 
"It has the hallmarks of both domestic and international (attacks), and you can see either side of that," former FBI Assistant Director Tom Fuentes told CNN. See all photography related to the Boston bombings. Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston Evidence photos from Boston HIDE CAPTION << < 
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Nurse practitioner Maureen Quaranto, who treated victims of the Boston Marathon bombings, wears her Boston Marathon jacket during Mass at the Cathedral of the Holy Cross on Sunday, April 21, in Boston. The city was working to get back to normal after the capture of the second of two suspects. See all photography related to the Boston bombings. From left, Boston Police Department Superintendents Kevin Buckley and William Evans attend the Mass at the Cathedral of the Holy Cross with Police Commissioner Edward Davis on April 21. Photos of the deceased are displayed at the Cathedral of the Holy Cross on April 21, the first Sunday since the Boston Marathon bombings. Boston Police Department Superintendent William Evans, right, kneels during the service at the Cathedral of the Holy Cross on April 21. Parishioners gathered for a morning service at the Redeemer Fellowship Church on April 21, just a few blocks from the crime scene on Franklin Street where major police activity occurred on April 19 during the manhunt for Dzhokhar Tsarnaev, in Watertown, Massachusetts. Leaders of an interfaith service participated in a vigil at the memorial for the victims of the Boston Marathon bombings, near the finish line on Boylston Street in Boston on April 21. Crowds gathered to participate in an interfaith memorial service with leaders from six churches at a makeshift memorial for victims near the site of the Boston Marathon bombings at the intersection of Boylston and Berkeley streets on April 21. The makeshift memorial honoring the victims of the Boston Marathon explosions on Boylston Street continues to grow as onlookers gather on April 21. Nicole Collier Lynch, center, sister of slain MIT police officer Sean Collier, hugs a Wellesley police officer during a vigil at the Town Common in Wilmington, Massachusetts, on Saturday, April 20. Collier, 26, was shot multiple times in his car on Thursday night as Boston Marathon bombing suspects Dzhokhar Tsarnaev and his brother Tamerlan tried to evade capture. A woman holds an American flag at a makeshift memorial on April 20, near the scene of the Boston Marathon explosions. People gather at a makeshift memorial for victims on April 20. A flag decorates the memorial on Boylston Street in Boston on April 20. Watertown residents gather to attend a candlelight vigil at Victory Park on April 20. A boy visits a makeshift memorial on Boylston Street in Boston on April 20. A man looks out onto Boylston Street on April 20. Items hang from a barrier Saturday at the makeshift memorial near the site of the Boston Marathon bombings. Huntsville, Alabama, residents hold a prayer vigil on Friday, April 19, for those lost and injured in the bombing at the Boston Marathon. Three people died when two bombs went off Monday, April 15, near the finish line. View photos from the attacks. A man rings a bell at the vigil in Huntsville on April 19. Two women embrace during a candlelight vigil in Somerville, Massachusetts, for the victims of the Boston Marathon bombing on Thursday, April 18. People hold candles as they listen to a speaker during a vigil in Somerville, Massachusetts, on April 18. President Barack Obama talks with Massachusetts General Hospital staff on April 18 while visiting patients injured in the terror attack. A man at the BoMA restaurant across the street from the Cathedral of the Holy Cross in Boston watches President Obama speak on television at the cathedral honoring the victims of the Boston Marathon bombings on April 18. People watch President Obama at Cathedral High School in Boston on April 18. A running shoe and U.S. flag are part of a memorial on the Boston Marathon route on April 18. President Barack Obama and first lady Michelle Obama arrive at the interfaith service for the victims of the Boston Marathon bombing, at the Cathedral of the Holy Cross in Boston, on April 18. Mourners filled the cathedral in Boston on April 18 for the the interfaith service. President Barack Obama, Michelle Obama and Massachusetts Gov. Deval Patrick attend the interfaith prayer service on April 18. People gather outside of the Cathedral of the Holy Cross. A nun hugs a woman at the interfaith prayer service. A flag flies at half staff on April 17 near the scene of the Boston Marathon bombings. First lady Michelle Obama takes part in a moment of silence for victims of the bombings at the Boston Marathon during a bill-signing ceremony at the Maryland State House in Annapolis, Maryland, on April 17. Flowers, running shoes and other items are left in memory of Chinese graduate student Lingzi Lu, who was killed during the bomb explosions on April 17. Joy Liu, 23, puts a green hat with a shamrock and a note with the words "From Boston and Beijing with love. RIP" at the memorial for Lu. Boston Bruins fans sing the national anthem during pregame ceremonies on April 17 in remembrance of the Boston Marathon bombing victims. Brooks Orpik of the Pittsburgh Penguins shows his support for Boston with a sticker on his helmet during the Penguins' game against the Montreal Canadiens on April 17. A moment of silence was held for the victims of the Boston Marathon bombings before a hockey game between the Boston Bruins and the Buffalo Sabres on April 17. People pray during a vigil held by the city of Cambridge, Massachusetts, on April 17 to show support for those affected by the Boston Marathon bombings. Dennis Seidenberg of the Boston Bruins observes a moment of silence for the victims of the Boston Marathon bombings before the start of an NHL hockey game in Boston against the Buffalo Sabres on Wednesday, April 17. It was the first sporting event held in the city since the bombings. A man places a message for the victims of the Boston bombings at a memorial site in Boston on April 17. Prior to an April 17 service at Marsh Chapel on the Boston University campus, members of the clergy walk past a memorial for graduate student Lu Lingzi, who was identified as the third person killed in the terror attack. Previously identified were Krystle Campbell, 29, of Arlington, Massachusetts, and Martin Richard, 8, of Dorchester, Massachusetts. Danielle Cerroni writes a chalk message on the street on April 17 at the scene of the explosions near the finish line of the Boston Marathon. Homeland Security Secretary Janet Napolitano observes a moment of silence for victims of the Boston bombing during a hearing before the Senate Homeland Security and Governmental Affairs Committee on April 17. A woman looks at memorials left at the scene of the Boston Marathon explosions. A man and woman leave after visiting the makeshift memorial on Boylston Street on April 17. A mother and daughter hold one another during a vigil in memory of 8-year-old Martin Richard of Dorchester at Garvey Park in Boston on Tuesday, April 16. A crowd holding candles gathers during a vigil on April 16 at Garvey Park in Boston for 8-year-old Martin Richard of Dorchester, who was killed in the marathon bombing. People gather in Boston Common on April 16 for a candlelight vigil for victims of the bombings in Boston. Hundreds gather at the impromptu vigil on Boston Common. Emerson College students embrace one another at the vigil on Boston Common on April 16. Attendees hold candles in honor of the victims at an interfaith service at Arlington Street Church in Boston on April 16. A woman uses her hand to keep wind from her candle as she stands with others around the pond in the Boston Public Gardens after a candlelight interfaith service at Arlington Street Church on April 16. Mourners gather on the edge of the pond in the Boston Public Gardens for a candlelight vigil on April 16. Visitors fill Arlington Street Church for a candlelight vigil on April 16. Students from the Clifden Academy hold an American flag and candles during a vigil on April 16 in Dorcester, Massachusetts, in honor of 8-year-old Martin Richard, who was killed in the bombings. People walk along the barricade at Boylston Street on April 16, following yesterday's bomb attack on the Boston Marathon. On the shared porch of their home in Medford, Massachusetts, on April 16, Colleen Howe, left, and Lisa O'Leary grieve for their neighbor, Patty Campbell, who lost her daughter Krystle Campbell in the bombings. Nicole Rand, left, who ran the marathon, embraces with her mother, Maureen Joham, on April 16 as she recounts her experience in Boston. Attendees of the vigil sign a large poster in honor of the victims of the bombing on April 16. Mourners hug one another during a vigil for victims of the Boston Marathon bombings at Boston Common A man carries balloons, flowers and flags to a memorial for victims on April 16, just blocks from the scene of the bombings. American flags hang from a barrier on April 16 at a roadblock staffed by National Guard soldiers at the end of Boylston Street near the site of the bombings in Boston. Mike Vitale, who lives in the Boston area, prays beside a makeshift memorial at a roadblock at the end of Boylston Street. Emerson College students Rachel Ferullo, left, and Kathryn Waxman at a vigil on Boston Common for victims of the bombings. Runners Judy Adler, left, and her daughter, Rachel Schapiro, embrace during a moment of silence at the Baptist Health South Florida Brickell Run Club event organized on April 16 in Miami in honor of victims of the Boston Marathon bombings. Five-time Boston Marathon runner Jose Sotolongo, center, reacts during a moment of silence at the Baptist Health South Florida Brickell Run Club event in Miami on April 16. The New York Islanders and Florida Panthers stand for a moment of silence for the bombings at the Boston Marathon before their game at Nassau Veterans Memorial Coliseum on April 16 in Uniondale, New York. Members of the Boston Red Sox observe a moment of silence before their game against the Cleveland Indians on April 16 in Cleveland. People walk Boylston Street where memorials have been set up to the corner of Berkeley after the barricades were moved back on April 16. A woman prays at a security gate near the scene of the bomb attack where visitors have congregated on April 16. See the aftermath in Boston. From left, Boston Marathon runners Tammy Snyder, Diane Deigmann and Lisa Kresky-Griffin embrace at the barricaded entrance to Boylston Street near the finish line of the Boston Marathon on April 16. Two young girls leave flowers on the steps outside the home of 8-year-old Martin Richards, who was killed in one of the explosions at the marathon. Several former Heisman Trophy winners, including former Saints running back George Rogers, right, observe a moment of silence for the bombing victims Tuesday before working on a Habitat for Humanity home in New Orleans. Traders observe a moment of silence on Tuesday before the opening bell on the floor of the New York Stock Exchange. The flag above the White House flies at half staff on Tuesday, April 16 in Washington. The Minnesota Twins stand during the national anthem before their game on Monday, April 15, in Minneapolis, following a moment of silence to honor the victims of the Boston Marathon bombings. President Barack Obama makes a statement about the bombings in the White House briefing room on Monday. Players and fans observe a moment of silence before the San Antonio Spurs and Golden State Warriors NBA game in Oakland, California, on Monday. A U.S. flag flies at half staff at the Capitol on Monday after House Speaker John Boehner ordered flags to be lowered. Fans pause for a moment of silence before the NHL game between the Phoenix Coyotes and the San Jose Sharks on Monday in Glendale, Arizona. See the world reaction to the attack. Mark Trumbo of the Los Angeles Angels of Anaheim stands during the National Anthem following a moment of silence to honor the victims of the Boston Marathon bombing before the game against the Minnesota Twins on April 15, 2013 in Minneapolis, Minnesota. See all photography related to the Boston bombings. Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victimss Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Photos: Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Photos: Nation mourns Boston bomb victims HIDE CAPTION << < 
From left, Boston Police Department Superintendents Kevin Buckley and William Evans attend the Mass at the Cathedral of the Holy Cross with Police Commissioner Edward Davis on April 21. 
Photos of the deceased are displayed at the Cathedral of the Holy Cross on April 21, the first Sunday since the Boston Marathon bombings. 
Boston Police Department Superintendent William Evans, right, kneels during the service at the Cathedral of the Holy Cross on April 21. 
Parishioners gathered for a morning service at the Redeemer Fellowship Church on April 21, just a few blocks from the crime scene on Franklin Street where major police activity occurred on April 19 during the manhunt for Dzhokhar Tsarnaev, in Watertown, Massachusetts. 
Leaders of an interfaith service participated in a vigil at the memorial for the victims of the Boston Marathon bombings, near the finish line on Boylston Street in Boston on April 21. 
Crowds gathered to participate in an interfaith memorial service with leaders from six churches at a makeshift memorial for victims near the site of the Boston Marathon bombings at the intersection of Boylston and Berkeley streets on April 21. 
The makeshift memorial honoring the victims of the Boston Marathon explosions on Boylston Street continues to grow as onlookers gather on April 21. 
Nicole Collier Lynch, center, sister of slain MIT police officer Sean Collier, hugs a Wellesley police officer during a vigil at the Town Common in Wilmington, Massachusetts, on Saturday, April 20. Collier, 26, was shot multiple times in his car on Thursday night as Boston Marathon bombing suspects Dzhokhar Tsarnaev and his brother Tamerlan tried to evade capture. 
A woman holds an American flag at a makeshift memorial on April 20, near the scene of the Boston Marathon explosions. 
People gather at a makeshift memorial for victims on April 20. 
A flag decorates the memorial on Boylston Street in Boston on April 20. 
Watertown residents gather to attend a candlelight vigil at Victory Park on April 20. 
A boy visits a makeshift memorial on Boylston Street in Boston on April 20. 
A man looks out onto Boylston Street on April 20. 
Items hang from a barrier Saturday at the makeshift memorial near the site of the Boston Marathon bombings. 
Huntsville, Alabama, residents hold a prayer vigil on Friday, April 19, for those lost and injured in the bombing at the Boston Marathon. Three people died when two bombs went off Monday, April 15, near the finish line. View photos from the attacks. 
A man rings a bell at the vigil in Huntsville on April 19. 
Two women embrace during a candlelight vigil in Somerville, Massachusetts, for the victims of the Boston Marathon bombing on Thursday, April 18. 
People hold candles as they listen to a speaker during a vigil in Somerville, Massachusetts, on April 18. 
President Barack Obama talks with Massachusetts General Hospital staff on April 18 while visiting patients injured in the terror attack. 
A man at the BoMA restaurant across the street from the Cathedral of the Holy Cross in Boston watches President Obama speak on television at the cathedral honoring the victims of the Boston Marathon bombings on April 18. 
People watch President Obama at Cathedral High School in Boston on April 18. 
A running shoe and U.S. flag are part of a memorial on the Boston Marathon route on April 18. 
President Barack Obama and first lady Michelle Obama arrive at the interfaith service for the victims of the Boston Marathon bombing, at the Cathedral of the Holy Cross in Boston, on April 18. 
Mourners filled the cathedral in Boston on April 18 for the the interfaith service. 
President Barack Obama, Michelle Obama and Massachusetts Gov. Deval Patrick attend the interfaith prayer service on April 18. 
People gather outside of the Cathedral of the Holy Cross. 
A nun hugs a woman at the interfaith prayer service. 
A flag flies at half staff on April 17 near the scene of the Boston Marathon bombings. 
First lady Michelle Obama takes part in a moment of silence for victims of the bombings at the Boston Marathon during a bill-signing ceremony at the Maryland State House in Annapolis, Maryland, on April 17. 
Flowers, running shoes and other items are left in memory of Chinese graduate student Lingzi Lu, who was killed during the bomb explosions on April 17. 
Joy Liu, 23, puts a green hat with a shamrock and a note with the words "From Boston and Beijing with love. RIP" at the memorial for Lu. 
Boston Bruins fans sing the national anthem during pregame ceremonies on April 17 in remembrance of the Boston Marathon bombing victims. 
Brooks Orpik of the Pittsburgh Penguins shows his support for Boston with a sticker on his helmet during the Penguins' game against the Montreal Canadiens on April 17. 
A moment of silence was held for the victims of the Boston Marathon bombings before a hockey game between the Boston Bruins and the Buffalo Sabres on April 17. 
People pray during a vigil held by the city of Cambridge, Massachusetts, on April 17 to show support for those affected by the Boston Marathon bombings. 
Dennis Seidenberg of the Boston Bruins observes a moment of silence for the victims of the Boston Marathon bombings before the start of an NHL hockey game in Boston against the Buffalo Sabres on Wednesday, April 17. It was the first sporting event held in the city since the bombings. 
A man places a message for the victims of the Boston bombings at a memorial site in Boston on April 17. 
Prior to an April 17 service at Marsh Chapel on the Boston University campus, members of the clergy walk past a memorial for graduate student Lu Lingzi, who was identified as the third person killed in the terror attack. Previously identified were Krystle Campbell, 29, of Arlington, Massachusetts, and Martin Richard, 8, of Dorchester, Massachusetts. 
Danielle Cerroni writes a chalk message on the street on April 17 at the scene of the explosions near the finish line of the Boston Marathon. 
Homeland Security Secretary Janet Napolitano observes a moment of silence for victims of the Boston bombing during a hearing before the Senate Homeland Security and Governmental Affairs Committee on April 17. 
A woman looks at memorials left at the scene of the Boston Marathon explosions. 
A man and woman leave after visiting the makeshift memorial on Boylston Street on April 17. 
A mother and daughter hold one another during a vigil in memory of 8-year-old Martin Richard of Dorchester at Garvey Park in Boston on Tuesday, April 16. 
A crowd holding candles gathers during a vigil on April 16 at Garvey Park in Boston for 8-year-old Martin Richard of Dorchester, who was killed in the marathon bombing. 
People gather in Boston Common on April 16 for a candlelight vigil for victims of the bombings in Boston. 
Hundreds gather at the impromptu vigil on Boston Common. 
Emerson College students embrace one another at the vigil on Boston Common on April 16. 
Attendees hold candles in honor of the victims at an interfaith service at Arlington Street Church in Boston on April 16. 
A woman uses her hand to keep wind from her candle as she stands with others around the pond in the Boston Public Gardens after a candlelight interfaith service at Arlington Street Church on April 16. 
Mourners gather on the edge of the pond in the Boston Public Gardens for a candlelight vigil on April 16. 
Visitors fill Arlington Street Church for a candlelight vigil on April 16. 
Students from the Clifden Academy hold an American flag and candles during a vigil on April 16 in Dorcester, Massachusetts, in honor of 8-year-old Martin Richard, who was killed in the bombings. 
People walk along the barricade at Boylston Street on April 16, following yesterday's bomb attack on the Boston Marathon. 
On the shared porch of their home in Medford, Massachusetts, on April 16, Colleen Howe, left, and Lisa O'Leary grieve for their neighbor, Patty Campbell, who lost her daughter Krystle Campbell in the bombings. 
Nicole Rand, left, who ran the marathon, embraces with her mother, Maureen Joham, on April 16 as she recounts her experience in Boston. 
Attendees of the vigil sign a large poster in honor of the victims of the bombing on April 16. 
Mourners hug one another during a vigil for victims of the Boston Marathon bombings at Boston Common 
A man carries balloons, flowers and flags to a memorial for victims on April 16, just blocks from the scene of the bombings. 
American flags hang from a barrier on April 16 at a roadblock staffed by National Guard soldiers at the end of Boylston Street near the site of the bombings in Boston. 
Mike Vitale, who lives in the Boston area, prays beside a makeshift memorial at a roadblock at the end of Boylston Street. 
Emerson College students Rachel Ferullo, left, and Kathryn Waxman at a vigil on Boston Common for victims of the bombings. 
Runners Judy Adler, left, and her daughter, Rachel Schapiro, embrace during a moment of silence at the Baptist Health South Florida Brickell Run Club event organized on April 16 in Miami in honor of victims of the Boston Marathon bombings. 
Five-time Boston Marathon runner Jose Sotolongo, center, reacts during a moment of silence at the Baptist Health South Florida Brickell Run Club event in Miami on April 16. 
The New York Islanders and Florida Panthers stand for a moment of silence for the bombings at the Boston Marathon before their game at Nassau Veterans Memorial Coliseum on April 16 in Uniondale, New York. 
Members of the Boston Red Sox observe a moment of silence before their game against the Cleveland Indians on April 16 in Cleveland. 
People walk Boylston Street where memorials have been set up to the corner of Berkeley after the barricades were moved back on April 16. 
A woman prays at a security gate near the scene of the bomb attack where visitors have congregated on April 16. See the aftermath in Boston. 
From left, Boston Marathon runners Tammy Snyder, Diane Deigmann and Lisa Kresky-Griffin embrace at the barricaded entrance to Boylston Street near the finish line of the Boston Marathon on April 16. 
Two young girls leave flowers on the steps outside the home of 8-year-old Martin Richards, who was killed in one of the explosions at the marathon. 
Several former Heisman Trophy winners, including former Saints running back George Rogers, right, observe a moment of silence for the bombing victims Tuesday before working on a Habitat for Humanity home in New Orleans. 
Traders observe a moment of silence on Tuesday before the opening bell on the floor of the New York Stock Exchange. 
The flag above the White House flies at half staff on Tuesday, April 16 in Washington. 
The Minnesota Twins stand during the national anthem before their game on Monday, April 15, in Minneapolis, following a moment of silence to honor the victims of the Boston Marathon bombings. 
President Barack Obama makes a statement about the bombings in the White House briefing room on Monday. 
Players and fans observe a moment of silence before the San Antonio Spurs and Golden State Warriors NBA game in Oakland, California, on Monday. 
A U.S. flag flies at half staff at the Capitol on Monday after House Speaker John Boehner ordered flags to be lowered. 
Fans pause for a moment of silence before the NHL game between the Phoenix Coyotes and the San Jose Sharks on Monday in Glendale, Arizona. See the world reaction to the attack. 
Mark Trumbo of the Los Angeles Angels of Anaheim stands during the National Anthem following a moment of silence to honor the victims of the Boston Marathon bombing before the game against the Minnesota Twins on April 15, 2013 in Minneapolis, Minnesota. See all photography related to the Boston bombings. Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victimss Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Photos: Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Nation mourns Boston bomb victims Photos: Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Nation mourns Boston Marathon tragedy Photos: Nation mourns Boston bomb victims HIDE CAPTION << < 
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80 > >> Photos: Nation mourns Boston bomb victims An FBI official said agents interviewed Tamerlan Tsarnaev in 2011 at the request of the Russian government. The FBI said Russia claimed he was a follower of radical Islam and that he had changed drastically since 2010.
But a U.S. official and a law enforcement source said Sunday the Russian government's request was vague. The lack of specifics limited how much the FBI was able to investigate Tamerlan, the law enforcement official said.
Tamerlan Tsarnaev apparently became increasingly radical in the past three or four years, according to an analysis of his social media accounts and the recollections of family members. But so far there has been no evidence of active association with international jihadist groups.
In August 2012, soon after returning from a visit to Russia, the elder Tsarnaev brother created a YouTube channel with links to a number of videos. Two videos under a category labeled "Terrorists" were deleted. It's not clear when or by whom.
A CNN analysis of the YouTube channel determined one deleted video featured a militant named Abu Dujana, whose real name was Gadzhimurad Dolgatov. CNN has located a video clip of the footage in question.
Russian security services killed Dolgatov in December during an assault on an apartment in the Russian Caucasus republic of Dagestan. Dolgatov led a small group in Dagestan that had links to the main Islamist militant group in the region, Imarat Kavkaz.
Separately, a U.S. intelligence source told CNN that investigators are looking into whether Tsarnaev had any connections with the group, known in English as Caucasus Emirates. The source says Tsarnaev had several computer links to the group in his social media activities, and investigators are looking into the possibility that he received "operational plans" from this group.
Five stories you missed during bombings
Rebels who call themselves Mujahideen of the Caucasus Emirate Province of Dagestan issued a statement Sunday that appeared to distance the group from the Boston bombings, saying they are not fighting the United States.
"We are at war with Russia," it said. The statement also said that children are never targets of the group.
Moving forward
A week after the marathon bombings, 55 remain hospitalized, including three in critical condition, according to a CNN tally.
At least a dozen survivors have endured amputations.
Tsarnaev, meanwhile, remains in serious but stable condition with a gunshot wound on his neck, a federal law enforcement source with knowledge of the investigation told CNN on Sunday.
It is unclear whether Tsarnaev was wounded during his capture or in the earlier shootout with police that left his older brother dead, said the source, who spoke on condition of anonymity.
"He's not in a condition to be interrogated at this time," Davis told reporters Sunday afternoon.
Obama learned tough lessons on using word "terror"
Authorities have not publicly stated what charges will be filed against Tsarnaev, but a Justice Department official who has been briefed on the case told CNN he will face federal terrorism charges and possibly state murder charges.
While Massachusetts does not have a death penalty, prosecutors could seek the death penalty at the federal level.
A run to remember
On the one-week anniversary of the Boston attacks, thousands of runners across the country will pound the pavement in a show of unity and support for the victims and their families.
At least 80 cities are participating in #BostonStrong, a "Run for Boston in Your City" campaign, organizer Brian Kelley said.
The global campaign is "a run for us to unite and show our strength, a run for those that were unable to finish, a run for those that may never run again" and "a run for us to try and make sense of the tragedy that has forever changed something we love."
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