The Napa County Sheriff's Office says there is police activity going on in the area.
Reports of an active shooter at the Veterans Home of California-Yountville came in around 10:30 a.m., local time, a spokeswoman for the department told the San Francisco Chronicle. Investigators know who the gunman is and they know he is armed with a rifle. CHP and Napa County fire officials could not immediately be reached for comment.
"We have hostage, hostage negotiators from at least three different agencies on site so that when we make contact with the suspect, we can begin negotiations", Childs said.
Robert Nacke told reporters that he knew of no injuries, and authorities gave no immediate information about the gunman or his motive.
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Yountville is a town of about 3,000 residents in the north San Francisco Bay area. Thornton said her 96-year-old father - a WWII fighter pilot - was inside a hospital wing and she had reached one of his friends who said he was safe.
According to the Napa Valley Register, police were called to the Veterans Home to investigate a report of a man with a gun.
It is unclear if the shots were live rounds, according to an official from the Veteran's Home.
CNN reports that the center is home to around 1,000 retired veterans and is the largest such facility in the country.