Massachusetts Institute of Technology police officers march as they depart St. Patrick's Church in Stoneham, Mass., following a funeral Mass for MIT police officer Sean Collier, 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. Law enforcement official at right is unidentified. (AP Photo/Steven Senne)
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