The FBI has released photos of two suspects in the Boston Marathon bombings and is asking for the public's help in identifying them.
FBI Agent Richard DesLauriers says the photos came from surveillance cameras near the explosion sites.
The explosions Monday killed three people and injured more than 180.
The images were released hours after President Barack Obama and first lady Michelle Obama attended an interfaith service at a Roman Catholic cathedral in Boston to remember the victims, including an 8-year-old boy.
Called upon to console a grieving city and reassure a shaken nation, President Barack Obama on Thursday promised that Boston would "run again" after deadly twin bombings at its famous marathon. More than 2,000 people rose in a standing ovation in the Cathedral of the Holy Cross and sang "America the Beautiful."
Obama's message of resolve in time of tragedy was echoed by Mayor Thomas Menino and Gov. Deval Patrick at a packed interfaith service.
"Nothing will take us down because we take care of one another," Menino said. "Even with the smell of smoke in the air and blood in the streets and tears in our eyes, we triumphed over that hateful act."
Three people were killed and more than 170 others were injured, some of them grievously, in Monday's bombings near the race's finish line.
Obama, in the midst of an emotional and trying stretch for the country and his presidency, vowed to track down those responsible and lauded Boston's "undaunted" spirit.
"Your resolve is the greatest rebuke to whoever committed this heinous act," he told the gathering.
Yet Obama's words underscored the stark reality that has left many Americans jittery. Officials still don't know who was responsible for the bombings or what their motivations were, though authorities appeared to be narrowing their search for a suspect.
For Obama, the bombings began a week consumed not only by terror but also disaster and political defeat. Letters sent to Washington officials, including Obama and Sen. Roger Wicker, R-Miss., were found to contain traces of poisonous ricin in tests, evoking eerie parallels to the anthrax attacks that followed the terror of Sept. 11, 2001.
The president also lost a fight for new gun control measures in the Senate, then awoke Thursday to news of a powerful fertilizer plant explosion that devastated a small Texas town.
Speaking from the pulpit in the soaring cathedral, the president didn't explicitly declare the deadly marathon explosions an "act of terror" as he did earlier in the week during remarks at the White House. But he showed little restraint in describing those responsible for the attack, calling them "small, stunted individuals."
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