This image released by the FBI on Thursday, April 18, 2013, shows in a image from video what the FBI is calling suspect number 1 with a black hat walking with a backpack in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)
Marathon bombing suspects
Photos in Gallery: 7
Posted: April 18, 2013
The FBI has released photos of two suspects in the Boston Marathon bombings and is asking for the public's help in identifying them.