FORT LEE, Va. >>An enraged soldier with a gun barricaded herself in an office inside a major command’s headquarters, throwing objects and then shooting herself in the head as law enforcement officials tried to negotiate with her, the Army said Monday.

The heavily-trafficked base went on lockdown while she was barricaded on the third floor of the four-story building that houses the Army’s Combined Arms Support Command. About 1,100 people were inside, but no one else was hurt, officials at Fort Lee said.

"This situation could’ve been worse," said Maj. Gen. Stephen R. Lyons, who took over as commanding general of CASC on Friday.

The Army did not identify the soldier or give her condition. She was taken to Virginia Commonwealth University Medical Center, which confirmed that it received a patient from Fort Lee but did not provide other details.

The soldier is a sergeant 1st class who has been in the Army for 14 years and at Fort Lee for three, Lyons said. Her gun was not a service weapon, he said.

"We are sad for our soldier in arms that she faced those kinds of challenges she had to resort to those kinds of actions," Lyons said.

He said officials did not know whether she was being treated for any mental health issues and could not speculate whether drugs or alcohol might have been a factor. Lyons described the soldier as upset and enraged during the incident but said he couldn’t say whether that was consistent with her personality.

Fort Lee reopened and normal operations resumed within an hour of the incident, Lyons said, with trucks and cars entering and exiting the base. The main gate — closest to the scene — continued to control traffic, but other gates were operating as normal.

The daily population at Fort Lee — 25 miles south of Richmond and 130 miles from Washington — is about 34,000, with members from all branches, their families, civilians and contractors. Fort Lee’s website says the installation has seen enormous growth and renovations over the past decade as a result of realignment and closures of bases across the U.S.

Army officials initially labeled Monday’s incident an "active shooter" situation. The Department of Homeland Security uses the term to describe someone actively trying to kill people, usually in populated areas, with no pattern of choosing victims.

The shooting is the fourth violent act at a Virginia military installation this year. In March, a civilian truck driver shot and killed a sailor aboard a Navy destroyer at Naval Station Norfolk before he was shot and killed by Navy security.

In June, authorities said a sailor repeatedly stabbed another near Naval Medical Center Portsmouth. The same installation was placed on lockdown in April when a sailor shot and killed himself inside a barracks there.

Monday’s lockdown came days after Fort Lee announced in its official newspaper that a new mass warning and emergency notification system would be activated in the coming weeks. It wasn’t immediately clear whether that system was used. The system allows users to input phone numbers, email addresses or pop-up alerts on any computer that’s part of the main Fort Lee network, the newspaper said.

___

Associated Press writer Brock Vergakis contributed to this report from Norfolk.