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In a photo provided by Massachusetts Institute of Technology, MIT police pallbearers carry the casket of fallen MIT officer Sean Collier during a memorial service on the MIT campus in Cambridge, Mass., Wednesday, April 24, 2013. Collier was fatally shot on campus Thursday night, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Massachusetts Institute of Technology, Dominick Reuter)

In a photo provided by Massachusetts Institute of Technology, MIT police pallbearers carry the casket of fallen MIT officer Sean Collier during a memorial service on the MIT campus in Cambridge, Mass., Wednesday, April 24, 2013. Collier was fatally shot on campus Thursday night, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Massachusetts Institute of Technology, Dominick Reuter)

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