FBI releases photos of Boston suspects
Photos of the two suspects, wearing baseball caps, near the scene of the blasts
The FBI has released photos of two suspects it wants to identify as part of the investigation into Monday's Boston Marathon bombings.
CCTV captured the two men, one wearing a dark-coloured baseball cap and the other a white cap, near the scene.
FBI Agent Richard DesLauriers warned members of the public not to approach the two men.
US President Barack Obama earlier vowed at a memorial service for victims the perpetrators would be held accountable.
Three people were killed and more than 170 wounded when the two bombs exploded near the finish line of the annual race.
At least 14 victims, including three children, remain in hospital in a critical condition.
Addressing a press conference in a Boston hotel on Thursday evening, Mr DesLauriers said of the two suspects: "We consider them to be armed and extremely dangerous."
He said footage showed the suspect in the white hat putting his backpack down at the site of the second explosion just in front of the Forum restaurant.
"We strongly encourage those who were at the Forum restaurant but haven't contacted us yet to do so," he said.
Mr DesLauriers said the FBI was aware of no additional threat.
At least one of the Boston bombs was made from a pressure cooker packed with explosives, nails and ball bearings, investigators have told US media. The devices were placed in black bags and left on the ground.
Earlier, President Obama told an interfaith ceremony at the Cathedral of the Holy Cross, the main Roman Catholic cathedral in Boston, that everyone had been touched by the attack on their city.
He appeared in sombre mood as he joined city leaders, residents and victims at the prayer service.
He told the congregation: "The spirit of this city is undaunted; the spirit of this country shall remain undimmed.
"Every one of us has been touched by this attack on your beloved city. Every one of us stands with you. Because after all it's our beloved city too.
"They sought to intimidate us, to terrorise us," President Obama said, adding, "It should be pretty clear by now that they picked the wrong city to do it."
He was applauded as he warned the perpetrators of the attacks they would be brought to justice.
"We will find you," he said. "We will hold you accountable."
Hundreds of people stood outside the cathedral during the service, while police at the bomb site listened to the president's speech on the radios in their patrol cars.
Former Republican presidential challenger Mitt Romney also attended the prayer ceremony.
On Thursday Homeland Security Secretary Janet Napolitano said security had been increased at airports and transport hubs.
Investigators are going through thousands of images taken around the time of the attacks from security cameras, the media and people at the scene.
The twin blasts killed Martin Richard, aged eight, Krystle Campbell, 29, and Lu Lingzi, a postgraduate student from China.
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