The California Department of Veterans Affairs said it was following reports of gunfire at the home, and that the safety of its residents, workers and the community were its top priority. He spoke to her by phone.
The Napa Valley Register reported an armed gunman, dressed in black with body armor, entered the building and may have taken hostages.
Robert Nacke told reporters that he knew of no injuries.More news: Serena makes declaration on return to the courts after childbirth
Kamer says his wife is now inside the home's dining hall and is not allowed to leave. He said he did not know if the shooter was a veteran receiving treatment from the home. Yountville sits about 56 miles north of San Francisco and is in the North Bay portion of the San Francisco Bay area. An armoured police vehicle, ambulances and several fire trucks were at the scene.
The California Highway Patrol said via Twitter its officers are on the scene working with Napa County Sheriff's deputies "to bring the situation to a safe conclusion".
Police have evacuated the property, though some people were still trapped inside.More news: Know The History Of International Women's Day
An armed man took three hostages during an "active shooter situation" at a California veterans home Friday afternoon, a fire official said, according to the Associated Press.
The veterans home was under lockdown and people inside were told to shelter in place, local media reported.
The Napa County Sheriff's Department issued an alert to residents at 10:30 a.m. warning them to avoid the area.More news: Arsenal stun Milan with 2-0 San Siro success
The Pathway Home is a privately run program on the veteran home's grounds, in the wealthy Napa Valley town of Yountville.