Nightly News   |  March 22, 2013

Marine kills 2 colleagues at Quantico

A Marine opened fire on two of his comrades Thursday night at a base in Quantico, Va., before turning the gun on himself, leaving all three dead. NBC’s Brian Williams reports.

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>>> an awful week for the u.s. marine corps got worse last night when a marine shot and killed a male and a female colleague and then shot himself to death. it happened at the officer candidate school of marine corps base camp quantico 40 miles south of washington. all three people involved were staff members on active duty at quantico. ellier this week seven marines were killed in a mortar training exercise in the nevada desert .