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WATERTOWN, MA - APRIL 19: (ALTERNATE CROP) Police with guns drawn search 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. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
WATERTOWN, MA - APRIL 19: (ALTERNATE CROP) Police with guns drawn search 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. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)

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Amateur video may show Watertown shootout

Amateur video shows shootout in Watertown, Massachusetts. CNN cannot independently confirm the location or circumstances.

Amateur video may show Watertown shootout

Amateur video shows shootout in Watertown, Massachusetts. CNN cannot independently confirm the location or circumstances.