Police salute as a U.S. flag is raised at the finish line during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)
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Police salute as a U.S. flag is raised at the finish line during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)
