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A Revere, Mass. police captain holds his cap while entering a memorial service for fallen Massachusetts Institute of Technology police officer Sean Collier, in Cambridge, Mass., Wednesday, April 24, 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)
Photo by: Steven Senne
A Revere, Mass. police captain holds his cap while entering a memorial service for fallen Massachusetts Institute of Technology police officer Sean Collier, in Cambridge, Mass., Wednesday, April 24, 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)

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