Earlier reports said the man was holding three people.
Robert Nacke told reporters that he knew of no injuries. She is in the home's dining hall and not allowed to leave.
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.
The California Highway Patrol was responding on Friday to an incident at a veterans' home in Napa Valley after local media said there were reports of shots fired and a hostage situation. CHP and Napa County fire officials could not immediately be reached for comment.
NASA mission discovers Jupiter's inner secrets Using this data, the researchers determined that the wind belts - these stripes observed by Galileo - extend 3,000 km deep. The recent findings will perk up understanding of the planet's core mass, interior structure and eventually, its origin.
Thornton says her 96-year-old father - a WWII fighter pilot - is inside a hospital wing at the home in Yountville, north of San Francisco.
The Napa County Register reports the man is wearing body armor and armed with an automatic weapon. An armoured police vehicle, ambulances and several fire trucks were at the scene.
Shots have been fired at officers, but now there no reports of injuries.
California Highway Patrol have said they have officers on the scene and are attempting to "bring the situation to a safe conclusion".
The Pathway Home is a privately run program on the veteran home's grounds, in the wealthy Napa Valley town of Yountville.
The state Veterans Affairs department says the home that opened in 1984 is the nation's largest veterans home, with about 1,000 elderly and disabled residents.
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