Funerals held for young bomb victim, slain officer
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A tribute honoring fallen Massachusetts Institute of Technology police officer Sean Collier is seen on a window of a truck that belonged to Collier as it departs St. Patrick's Church in Stoneham, Mass., following a funeral Mass, Tuesday, April 23, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Steven Senne)