The FBI released Thursday images of two men. In the video you see one walking behind the other not far from the marathon finish line.
Authorities say suspect two – the man in the white hat - left a bag containing explosives at the site of the second blast.
— OutFrontCNN (@OutFrontCNN) April 18, 2013
CLICK HERE for the FBI "Seeking Information" posters.
OutFront tonight: Congressman Mike McCaul - Chairman of the House Homeland Security committee.