FILE - A Boston police officer wheels an injured boy down Boylston Street as medical workers carry an injured runner after two explosions during the 2013 Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/Charles Krupa)

Associated Press
FILE - A Boston police officer wheels an injured boy down Boylston Street as medical workers carry an injured runner after two explosions during the 2013 Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/Charles Krupa)
FILE - A Boston police officer wheels an injured boy down Boylston Street as medical workers carry an injured runner after two explosions during the 2013 Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/Charles Krupa)
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