YOUNTVILLE (CBS SF) — SWAT officers carefully went building to building searching the grounds of the Yountville Veterans Home Tuesday morning after a report of a possible suspect armed with a shotgun before the all-clear was given.

“This morning the CHP received a report of what appeared to be a woman at Veterans Home of California – Yountville with what the caller described as a shotgun,” the CHP said in a Facebook post. “CHP and multiple allied agencies immediately responded and are currently conducting an extensive search via ground and air in an attempt to locate the possible subject.”

Occupants of the several buildings on the sprawling campus were moved into the church to shelter in place. Residents living near the grounds were also told to remain in their homes.

Just before noon, the Napa County Sheriff’s Office said police activity at the veterans home had concluded. There was no word of any suspect detained.

“There have been no reports of any shots fired or any additional reports of the subject. This is an ongoing incident and further updates will be provided from the CHP as the information becomes available.”

County officials and the Napa County Sheriff’s Department issued warnings to stay away from the area. Local residents reported hearing and seeing a large response by local law enforcement agencies.

Several reports have identified the possible suspect as a woman, wearing scrubs, carrying what looked like a shotgun in the vicinity of the Holderman building.

The veterans home was also the scene of a triple murder in March 2018. A veteran of the Afghanistan war named Albert Wong fatally shot three healthcare workers there before dying by suicide. Wong had been expelled from the home prior to the shooting.

The state-operated and owned Veterans Home is the largest in the United States. Last summer, it housed approximately 730 residents and employed about 850 people.