Boston bombing suspects: Investigators in the Boston Marathon bombing are working to determine the identities of two men, one carrying a backpack and the other dropping off a bag, who were at the scene prior to the explosions.
Three days after the Boston Marathon bombing hundreds of federal investigators are now chasing the name behind a face.
Video security clips from a Lord & Taylor department store across the street from the spot where the second bomb exploded show a man acting suspiciously, according to FBI personnel. He drops a bag and then walks away.
Images show him reacting to the first explosion by quickly exiting the site where the second explosion is about to occur.
The person in question is a young white man wearing a black jacket, a gray hooded sweatshirt, and a white or off-white baseball cap on backwards, according to CBS News.
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