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Shrapnel

A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15, 2013, in Boston. (credit: Jim Rogash/Getty Images)

CBS News: Boston Marathon Bomb Put In Metal Pressure Cooker

The two devices used in the Boston Marathon bombings were improvised explosive devices (IEDs), according to CBS News.

04/16/2013