QUANTICO, Va. (AP) — A Marine who worked at an officer candidates school fatally shot two colleagues, a man and a woman, before killing himself in a barracks dorm room, officials said.

Military officials did not release a motive or the identities of those slain. Authorities were called at the Marine Corps Base Quantico in northern Virginia around 10:30 p.m. Thursday and found one Marine dead in the barracks, base commander Col. David W. Maxwell said. A second victim was found elsewhere in Taylor Hall and the body of the gunman was also located there.

It wasn't immediately clear how much time passed between the killings or how far apart the bodies were found.