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A Marine allegedly shot two people to death and killed himself during a standoff at the U.S. Marine Corps Base Quantico in Virginia, military officials said.

The standoff about 11 p.m. Thursday after the gunman shot and wounded a person at the Officer Candidate School, WUSA-TV, Washington, reported. The victim later died.

The suspect, who Marine Corps spokesman Capt. Eric Flanagan identified as a staff member at the school, barricaded himself inside a barracks building, CNN reported.

Investigators gained access to the building by 2:45 a.m. Friday and found a second shooting victim along with the suspected gunman dead of an apparently self-inflicted gunshot wound, The Washington Post reported.

The identities of the two victims and the suspected gunman were not reported. At least one of the victims was a Marine, CNN reported.

The base was on lockdown for 4 hours during the standoff, the Post reported.