This image released by the FBI on Thursday, April 18, 2013, shows in a image from video of a man the FBI is calling suspect number 2, highlighted, with a
This image released by the FBI on Thursday, April 18, 2013, shows in a image from video of a man the FBI is calling suspect number 2, highlighted, with a white hat walking in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (Uncredited)