Investigators comb through the post finish line area of the Boston Marathon at Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston. (AP... more 
Investigators comb through the post finish line area of the Boston Marathon at Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston. (AP Photo/Julio Cortez) less 
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Associated Press | Photo By Julio Cortez
Wed, Apr 17, 2013 11:46 AM EDT