WATERTOWN, MA - APRIL 19: A police officer runs with his gun drawn while searching for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person wanted in connection with the deadly bombing at the Boston Marathon earlier this week. (Photo by Mario Tama/Getty Images)
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