A law enforcement officer stands post at the U.S. Capitol, Monday, April 15, 2013 in Washington. Authorities say the blasts during the Boston Marathon killed two people and injured at least 73,(AP Photo/Alex Brandon)

Associated Press
A law enforcement officer stands post at the U.S. Capitol, Monday, April 15, 2013 in Washington. Authorities say the blasts during the Boston Marathon killed two people and injured at least 73,(AP Photo/Alex Brandon)
A law enforcement officer stands post at the U.S. Capitol, Monday, April 15, 2013 in Washington. Authorities say the blasts during the Boston Marathon killed two people and injured at least 73,(AP Photo/Alex Brandon)
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