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Bill Greene/Globe Staff
Massachusetts State Police officers saluted during the memorial service for MIT Police Officer Sean Collier.
Wendy Maeda/Globe Staff
Honor guards were in attendance during the memorial service at Briggs Field in Cambridge.
New York Police Officer Kerry Market was one of thousands who attended the memorial service.
A student from MIT had a quiet moment outside Briggs Field.
Vice President Joseph Biden delivered emotional remarks at the service.
Thousands of police officers attended the memorial.
Senator Elizabeth Warren (left) looked on as Biden spoke at the service.
Sean Collier's brothers spoke at the memorial service.
A hearse bearing left Briggs Field after the service.
A Lexington police officer took a picture before the memorial service.
Police filed into the memorial service for MIT Police Officer Sean Collier at Briggs Field on the MIT campus.
People filed into Briggs Field for the service.
Collier, 27, was murdered last Thursday as a wave of violence that began with the Boston Marathon bombings.
More than 10,000 people attended the event.
Mourners arrived for the service in front of thousands of police officers.
Elise Amendola/Associated PRess
Police officers arrived by the thousands to the memorial service.
Members of the MIT community arrived for the service.
Police officers took their seats before the service began.
Jonathon Wiggs/Globe Staff
Police officers lined up outside Briggs Field at MIT before the memorial service for Collier.
James Taylor warmed up before the memorial service.
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