California Highway Patrol team confirmed on Twitter that officials in the area are aware of the situation at Yountville Veterans Home. The witnesses husband said the women were having a staff meeting, a celebration for employees that were leaving the facility, and the gunman entered as "calm as can be". Thornton said her "heart just bleeds for the people that are being held hostage".
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.
Larry Kamer, whose wife was released by the gunman, spoke with KTVU about the hostage situation.
Still, she worked about the stress of the lockdown on her father, considering his age and that he has post-traumatic stress disorder and some dementia.
Officials say they have yet to make contact with the suspect, but hostage negotiations will happen when they do. He says he doesn't know the status of the hostages or the gunman's motive.
Both ground and air ambulances were being staged near the Veterans Home as a precaution.
Jan Thornton of Vallejo is among hundreds of relatives anxious about their loved ones at a Northern California veterans home that was locked down after reports of an active shooter. Yountville sits about 56 miles north of San Francisco and is in the North Bay portion of the San Francisco Bay area.More news: 'The Bachelor': Arie & Lauren Reveal They've Considered Eloping After Dramatic Engagement
Jan Thornton, 51, said her father is a WWII veteran who lives in the skilled nursing section of the facility.
The Yountville facility is the largest veterans' home in the United States, with about 1,000 residents.
Residents were temporarily evacuated from the veterans home in October when fires raged through Napa County.
The Veterans Home is located at 260 California Drive near Domaine Chandon and Vintners Golf Club.
"We have activated our emergency response protocol and are cooperating with law enforcement", the department said in a Facebook post.
"We have not made contact with the gunman yet", Robertson said, adding that cops are "approaching this as an active shooter situation".
Police closed access to the large veterans home in Yountville after a man with a gun was reported on the grounds.