Boston Marathon bombing aftermath: Search for clues amid memorials

Associated Press
An investigator combs through trash pulled from a vin just beyond the Boston Marathon finish line on Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston.  Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)

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Authorities have reviewed countless photo and video evidence provided by the public as well as surveillance video from businesses near the finish line to aid their investigation into the twin bombs that exploded at the Boston Marathon on Monday. The crime scene also has been flooded with tributes for the victims.

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