The FBI has released photos and video of two suspects in the Boston Marathon bombings and is asking for the public's help in identifying the men.

FBI Agent Richard DesLauriers says the images came from surveillance cameras near the explosion sites shortly before the blasts.

"We consider them to be armed and extremely dangerous," DesLauriers said, asking the public not to approach the men.

He said there is no additional danger that the FBI knows of now.

Monday's blasts killed three and injured more than 180.

The images were released hours after President Barack Obama attended an interfaith in Boston to remember the victims, including an 8-year-old boy.