As of a 2 p.m. news conference, three people were still kept hostage while others had been released, and no injuries had been reported.
California authorities say some students rehearsing a play on the grounds of the veterans home had been locked down when a gunman took hostages.
Though she thinks her dad is safe, she is still anxious about the stress of the situation, considering his age and that he has post-traumatic stress disorder and some dementia.
The veterans home was under lockdown and people inside were told to shelter in place, local media reported.
Kamer said his wife was inside the home's dining hall and was not allowed to leave.
The hostages are employees of the facility's Pathway Home, a privately run program treating veterans of the Iraq and Afghanistan wars who suffer from post-traumatic stress disorder, cops said.
Events manager Elizabeth Naylor, who was working about 10 miles north of the veterans' home, said she heard waves of emergency sirens.
Nobody is known to be injured, he said, but earlier the man and officers fired shots at each other. An armored police vehicle, ambulances and several fire trucks were at the scene.
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The Veterans Home is built on roughly 600 acres, making it the largest veterans' home in the U.S., Kisser said.
Fransen said authorities were working to establish a secure perimeter around the facility, which is home to about 1,000 residents.
Founded in 1884, the facility houses about 1,000 aging vets and is the largest veterans home in the United States, according to the CalVet.
The Veterans Home is located at 260 California Drive near Domaine Chandon and Vintners Golf Club.
"We have not made contact with the gunman yet", Robertson said, adding that cops are "approaching this as an active shooter situation".
The Napa County Sheriff's Department issued an alert to residents at 10:30 a.m. warning them to avoid the area.
A black-clad man with body armor and an automatic weapon has taken at least three hostages, and reports of shots fired have surfaced.