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FBI releases photos of 2 suspects in Boston Marathon bombing

  • Photos of one of two suspects sought in the Boston Marathon bombing is displayed during a news conference talking about the investigation of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

    Photos of one of two suspects sought in the Boston Marathon bombing is displayed during a news conference talking about the investigation of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

  • Marathon runner Benton Berman accompanied by his dog Tank pauses on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston.  Berman said he was blocks away from finishing before the blasts occurred. (AP Photo/Matt Rourke)

    Marathon runner Benton Berman accompanied by his dog Tank pauses on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston. Berman said he was blocks away from finishing before the blasts occurred. (AP Photo/Matt Rourke)

  • Sarah Shallbetter cries as she watches a broadcast of President Barack Obama speaking at an interfaith service at Cathedral of the Holy Cross on a video screen at the BoMA restaurant in Boston Thursday, April 18, 2013. The service was held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140. (AP Photo/Matt Rourke)

    Sarah Shallbetter cries as she watches a broadcast of President Barack Obama speaking at an interfaith service at Cathedral of the Holy Cross on a video screen at the BoMA restaurant in Boston Thursday, April 18, 2013. The service was held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140. (AP Photo/Matt Rourke)

  • Police officers man a barricade in the vicinity of finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston. (AP Photo/Matt Rourke)

    Police officers man a barricade in the vicinity of finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston. (AP Photo/Matt Rourke)

  • Nursing students Katie Robinson, left, and Megan Beach listen to a broadcast on their phones from outside an interfaith service attended by President Barack Obama at the Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

    Nursing students Katie Robinson, left, and Megan Beach listen to a broadcast on their phones from outside an interfaith service attended by President Barack Obama at the Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

  • Responders search the area around the Boston Public Library near the finish line of the Boston Marathon with a ladder truck in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson)

    Responders search the area around the Boston Public Library near the finish line of the Boston Marathon with a ladder truck in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson)

  • Investigators sift through evidence on Boylston Street just up from the finish line of the Boston Marathon in Boston, Thursday, April 18, 2013. (AP Photo/Winslow Townson)

    Investigators sift through evidence on Boylston Street just up from the finish line of the Boston Marathon in Boston, Thursday, April 18, 2013. (AP Photo/Winslow Townson)

  • ATF agents and others examine an area of Boylston Street in Boston Thursday, April 18, 2013, as investigation of the Boston Marathon bombings continues. (AP Photo/Elise Amendola)

    ATF agents and others examine an area of Boylston Street in Boston Thursday, April 18, 2013, as investigation of the Boston Marathon bombings continues. (AP Photo/Elise Amendola)

  • Mourners attend a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

    Mourners attend a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

  • Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gather with others ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

    Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gather with others ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

  • President Barack Obama attends an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)

    President Barack Obama attends an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)

  • Lizzie Lee of Lynnwood, Wash., pauses near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Lee said she almost completed the marathon before the blasts. (AP Photo/Matt Rourke)

    Lizzie Lee of Lynnwood, Wash., pauses near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Lee said she almost completed the marathon before the blasts. (AP Photo/Matt Rourke)

  • Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common.  (AP Photo/Julio Cortez)

    Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

  • A line of investigators is form as they enter a building adjacent to one of the blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

    A line of investigators is form as they enter a building adjacent to one of the blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)

  • A officials stands guard in front of the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. President Barack Obama plans to attend a service honoring the victims Thursday in Boston, where police were stationed on street corners across downtown.  (AP Photo/Julio Cortez)

    A officials stands guard in front of the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. President Barack Obama plans to attend a service honoring the victims Thursday in Boston, where police were stationed on street corners across downtown. (AP Photo/Julio Cortez)

  • Officials in tactical gear stand guard behind a Boston Police Department barricade near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

    Officials in tactical gear stand guard behind a Boston Police Department barricade near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

  • An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store, which, an official said, is crucial in the investigation of the explosions near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston City Council President Stephen Murphy, who said Wednesday he was briefed by Boston police, said investigators saw an image on surveillance footage they got from the department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene. (AP Photo/Julio Cortez)

    An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store, which, an official said, is crucial in the investigation of the explosions near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston City Council President Stephen Murphy, who said Wednesday he was briefed by Boston police, said investigators saw an image on surveillance footage they got from the department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene. (AP Photo/Julio Cortez)

  • A mourner reacts during a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

    A mourner reacts during a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)

  • Shown is the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

    Shown is the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

  • Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues.  (AP Photo/Julio Cortez)

    Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. (AP Photo/Julio Cortez)

  • This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, front, in black cap, and suspect number 2, in white cap, back right, walking near each other through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

    This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, front, in black cap, and suspect number 2, in white cap, back right, walking near each other through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

  • Photos of one of two suspects sought in the Boston Marathon bombing is displayed during a news conference talking about the investigation of the Boston Marathon explosions, Thursday, April 18, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)
  • Marathon runner Benton Berman accompanied by his dog Tank pauses on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston.  Berman said he was blocks away from finishing before the blasts occurred. (AP Photo/Matt Rourke)
  • Sarah Shallbetter cries as she watches a broadcast of President Barack Obama speaking at an interfaith service at Cathedral of the Holy Cross on a video screen at the BoMA restaurant in Boston Thursday, April 18, 2013. The service was held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140. (AP Photo/Matt Rourke)
  • Police officers man a barricade in the vicinity of finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, in Boston. (AP Photo/Matt Rourke)
  • Nursing students Katie Robinson, left, and Megan Beach listen to a broadcast on their phones from outside an interfaith service attended by President Barack Obama at the Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)
  • Responders search the area around the Boston Public Library near the finish line of the Boston Marathon with a ladder truck in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson)
  • Investigators sift through evidence on Boylston Street just up from the finish line of the Boston Marathon in Boston, Thursday, April 18, 2013. (AP Photo/Winslow Townson)
  • ATF agents and others examine an area of Boylston Street in Boston Thursday, April 18, 2013, as investigation of the Boston Marathon bombings continues. (AP Photo/Elise Amendola)
  • Mourners attend a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)
  • Marathon runner Nathan Finney of Boston and his daughter Mckenna, 5, gather with others ahead of an interfaith service with President Barack Obama at Cathedral of the Holy Cross, held in the wake of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)
  • President Barack Obama attends an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)
  • Lizzie Lee of Lynnwood, Wash., pauses near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Lee said she almost completed the marathon before the blasts. (AP Photo/Matt Rourke)
  • Investigators inspect the area between the two blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common.  (AP Photo/Julio Cortez)
  • A line of investigators is form as they enter a building adjacent to one of the blast sites near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston remained under a heavy security presence, with scores of National Guard troops gathering among armored Humvees in the Boston Common. (AP Photo/Julio Cortez)
  • A officials stands guard in front of the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. President Barack Obama plans to attend a service honoring the victims Thursday in Boston, where police were stationed on street corners across downtown.  (AP Photo/Julio Cortez)
  • Officials in tactical gear stand guard behind a Boston Police Department barricade near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)
  • An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store, which, an official said, is crucial in the investigation of the explosions near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston City Council President Stephen Murphy, who said Wednesday he was briefed by Boston police, said investigators saw an image on surveillance footage they got from the department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene. (AP Photo/Julio Cortez)
  • A mourner reacts during a candlelight vigil in the aftermath of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Wednesday, April 17, 2013, at City Hall in Cambridge, Mass. (AP Photo/Matt Rourke)
  • Shown is the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)
  • Investigators inspect the roof of a building across the street from the area where a bomb exploded near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues.  (AP Photo/Julio Cortez)
  • This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, front, in black cap, and suspect number 2, in white cap, back right, walking near each other through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

The FBI released photos and video yesterday of two suspects in the Boston Marathon bombing and asked for the public’s help in identifying them, zeroing in on the two men on surveillance camera footage less than three days after the deadly attack.

FBI agent Richard DesLauriers said the photos of the two men came from surveillance cameras near the explosion sites. One man is seen wearing a dark baseball cap, the other a white cap worn backwards.

The man in the white cap is seen setting down a backpack at the site of one of the blasts, DesLauriers said.

Within moments of the announcement, the FBI website crashed, perhaps because of a crush of visitors.

The images were released hours after President Obama and first lady Michelle Obama attended an interfaith service at a Roman Catholic cathedral in Boston to remember the three people killed and more than 180 wounded in the twin blasts Monday at the marathon finish line.

The break in the investigation came just days after the attack that tore off limbs, shattered windows and raised the specter of another terrorist attack on U.S. soil.

The suspects are considered armed and extremely dangerous, DesLauriers said, and people who see them should not approach them.

“Do not take any action on your own,” he warned.

Generally, law enforcement agencies release photos of suspects only as a last resort, when they need the public’s help in identifying or capturing someone.

Releasing photos can be a mixed bag: It can tip off a suspect and deny the police the element of surprise. It can also trigger an avalanche of tips, forcing the police to waste valuable time chasing them down.

At the Cathedral of the Holy Cross earlier in the day, Obama declared to the people of Boston: “Your resolve is the greatest rebuke to whoever committed this heinous act.” He spoke in almost mocking terms of those who commit such violence.

“We finish the race, and we do that because of who we are,” the president said to applause. “And that’s what the perpetrators of such senseless violence – these small, stunted individuals who would destroy instead of build and think somehow that makes them important – that’s what they don’t understand.”

“We will find you,” he warned those behind the attack.

Seven victims remained in critical condition. Killed were 8-year-old Martin Richard of Boston, 29-year-old restaurant manager Krystle Campbell of Medford, Mass., and Lu Lingzi, a 23-year-old Boston University graduate student from China.

Video and photos recovered in the investigation are being examined and enhanced by an FBI unit called the Operational Technologies Division, said Joe DiZinno, former director of the FBI lab in Quantico, Va.

Investigators are looking at video frame by frame – a laborious process, though one aided by far more sophisticated facial recognition technology than is commercially available, forensic specialists said.

“When you have something that is this high-profile, they are going to use every available resource that they have,” said former Miami federal prosecutor Melissa Damian Visconti.

The investigation will probably collect about a million hours of videotape from fixed security cameras and cell phones and cameras used by spectators, said Gene Grindstaff, a scientist at Intergraph Corp., a Huntsville, Ala., company that makes video analysis software used by the FBI and other law enforcement agencies.

But after years of investigating terrorist incidents and other crimes, the FBI is practiced at cataloging, categorizing and analyzing such evidence and will winnow it down dramatically, he said.

“Back in the days of 20 years ago, you were lucky if you had video, and it was probably of poor quality and it took a tremendous amount of enhancement. Today you have a completely different issue,” Grindstaff said.

Investigators can set the video analysis software so that it automatically searches for certain types of objects or people matching a height and weight description. The software can also spot patterns that analysts might not notice, such as a certain car that turns up in different places, Grindstaff said.

DiZinno, who ran the FBI lab from 2007 to 2010, said any retrieved bomb components such as the pressure cookers, shrapnel and pieces of timers or wire will be closely examined for fingerprints, DNA, hairs and fibers.

The bomb components would be traced by figuring out the item’s maker, where each piece is typically purchased and whether the device resembles any bombs the FBI has seen in past attacks. The FBI lab keeps a detailed file on past bombings, including many overseas attacks.

“Let’s say there was a timer,” DiZinno said. “Was there a serial number? Who was the manufacturer? That can provide leads for investigators.”

One pressure cooker maker, the Fagor Group in Spain, said that it has been contacted by U.S. investigators and that company officials are extending full cooperation. The company sells 250,000 pressure cookers a year in the United States and 1 million worldwide.

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