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By Daniel Lovering CAMBRIDGE, Massachusetts (Reuters) - More than 1,600 people gathered at the Massachusetts Institute of Technology on Friday for a memorial service for a popular campus police officer shot to death a year ago in the aftermath of the Boston Marathon bombing. MIT police officer Sean Collier, 27, was shot multiple times in his car in an apparent confrontation with the bombing suspects days after the blast, which left three people dead and more than 260 injured when two homemade bombs exploded near the race's finish line. Collier was killed in an unsuccessful attempt to steal his gun, authorities said. Police officers, government officials, students and faculty joined members of Collier's family at the outdoor service under a tent a short distance from where Collier was killed, a place marked by a temporary memorial planted with flowers.