Boston Marathon Explosions

A sign with the photographs of Sean Collier, bottom left, a Massachusetts Institute of Technology officer killed, and Richard Donohue, a Boston Police officer who was shot and critically wounded, is seen at a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon, Saturday, April 20, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured late Friday evening in Watertown, Mass. (AP Photo/Julio Cortez) ORG XMIT: MAJC102
A sign with the photographs of Sean Collier, bottom left, a Massachusetts Institute of Technology officer killed, and Richard Donohue, a Boston Police officer who was shot and critically wounded, is seen at a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon, Saturday, April 20, 2013, in Boston. Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured late Friday evening in Watertown, Mass. (AP Photo/Julio Cortez) ORG XMIT: MAJC102

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