A photo of Martin Richard, 8, hangs at a makeshift memorial near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Richard was killed in the explosions. (AP Photo/Matt Rourke)

Associated Press
A photo of Martin Richard, 8, hangs at a makeshift memorial near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Richard was killed in the explosions. (AP Photo/Matt Rourke)
A photo of Martin Richard, 8, hangs at a makeshift memorial near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. Richard was killed in the explosions. (AP Photo/Matt Rourke)
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