"Law enforcement authorities have responded to the Yountville Veterans Home this morning following reports of gunfire near the main dining hall".
Earlier, it emerged the veterans home was on lockdown after reports of shots fired.
Larry Kamer says his wife, Devereaux Smith, is a fundraiser for the nonprofit Pathway Home. As KTVU's Mark Ibanez arrived at the scene, he was told by SWAT to stay behind something, "because this guy has an automatic weapon".
Yountville is a town of about 3,000 residents in the north San Francisco Bay area. She said she's lived in Yountville since 1995 and is rattled about a shooting so close to home.
Napa County Fire captain Chase Beckman said earlier that the gunman took at least three people hostage.
Gunman takes hostages at US veterans home
The report came in at 10:20 a.m., resulting in dozens of law enforcement officers from multiple agencies to set up a perimeter around the Veterans Home, according to the Napa Valley Register. An employee at the veterans home told her to close and lock her door.
An armored police vehicle, ambulances and several firetrucks could be seen at the scene. "Further official information will be provided by law enforcement when it is confirmed".
Events manager Elizabeth Naylor, who was working about 16km north of the veterans' home, said she heard waves of emergency sirens.
The Yountville Veterans Home is the largest such facility in the United States and is home to about 1,000 veterans, according to the home's website.
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Police did not describe the homemade bomb in detail but said it " had the potential to cause significant injury or death ". State police take a zero-tolerance approach to every threat that is reported, according to the police report .