Police officers and civilians arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday. He had worked for the department a little more than a year. (AP Photo/Elise Amendola)

Associated Press
Police officers and civilians arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013.  Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday. He had worked for the department a little more than a year.  (AP Photo/Elise Amendola)
Police officers and civilians arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday. He had worked for the department a little more than a year. (AP Photo/Elise Amendola)
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