By The Associated Press
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) (AP Photo/FBI)
In surveillance-camera footage released by the FBI, two men identified as suspects in the Boston Marathon bombing are seen walking one behind the other in the crowd. The suspect wearing a white hat was seen setting down a backpack at the site of the second explosion, said Richard DesLauriers, FBI agent in charge in Boston.
This series of chronological images from the FBI video shows the two suspects walking through the crowd at the Boston Marathon
