CAMBRIDGE, Mass. -- A Massachusetts Institute of Technology campus police officer was shot and killed Thursday night at the school's campus, authorities said, triggering a massive display of police force in the Boston area.
Police reported exchanging gunfire with alleged carjackers in Watertown, a city next to Cambridge, a short time after the MIT shooting. At least one and perhaps more explosions were heard in Watertown.
The events unfolded overnight as the entire Boston metro area was on high alert following Monday's fatal bomb explosions during the Boston Marathon and as the FBI was leading a massive manhunt for suspects.
It was not known if the Watertown events were related to the MIT shooting or the fatal explosions earlier in the week, but police response was massive with armored SWAT-type vehicle present.
Video from WCVB-TV showed police officers with guns drawn and apparently giving orders to a man face down on the street in Watertown.
At the scene in Watertown, an explosion could be heard, and police ordered journalists and spectators to move far back. Multiple police agencies were represented at the scene. Officers said they were looking for another suspect.