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Police attend the memorial service for MIT police officer Sean... News PhotoAttending,Cambridge - Massachusetts,Campus,Horizontal,Human Interest,Massachusetts,Memorial Event,Police Force,USAPhotographer Collection: Boston Globe 2013 - The Boston GlobeCAMBRIDGE, MA - APRIL 24: Police attend the memorial service for MIT police officer Sean Collier, at Briggs Field, on the MIT campus. Collier was killed during a shootout with the Boston Marathon bombing suspects. (Photo by Bill Greene/The Boston Globe via Getty Images)