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Boston Deals With Aftermath Of Marathon Explosions

MEDFORD, MA - APRIL 17: Flowers and a sign are left on a street post in Medford Square in remembrance of Krystle Campbell, 29, of Medford, Massachusetts, who was killed by the bomb explosions at the Boston Marathon on April 17, 2013 in Medford, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. (Photo by Jared Wickerham/Getty Images)

Boston Marathon bombing aftermath: Search for clues amid memorials

April 17, 2013

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.

Y! News: Latest updates on Boston Marathon bombing | Watch: Details of developments | Controversial Time cover | Photos: Horrific images after explosions