People walk to the information centre at the Veterans Home of California in Yountville, California. Picture: Ben Margot/AP
People walk to the information centre at the Veterans Home of California in Yountville, California. Picture: Ben Margot/AP
An armoured vehicle arrives at the Veterans Home of California in Yountville. Picture: Ben Margot/AP
An armoured vehicle arrives at the Veterans Home of California in Yountville. Picture: Ben Margot/AP
Media trucks stage at the entrance to the Veterans Home of California in Yountville where a gunman took at least three people hostage. Picture: Ben Margot/AP
Media trucks stage at the entrance to the Veterans Home of California in Yountville where a gunman took at least three people hostage. Picture: Ben Margot/AP
Law enforcement members stage near the Veterans Home of California after reports of an active shooter in Yountville. Picture: JL Sousa/Napa Valley Register via AP
Law enforcement members stage near the Veterans Home of California after reports of an active shooter in Yountville. Picture: JL Sousa/Napa Valley Register via AP
Fernando Juarez, 36, of Napa, center, embraces his 22-year-old sister Vanessa Flores, right, at the Veterans Home of California on Friday March 9, 2018. in Yountville, Calif. Flores, who is a caregiver at the facility, exchanged texts with family while sheltering in place. A gunman took at least three people hostage at the largest veterans home in the United States on Friday, leading to a lockdown of the sprawling grounds in California, authorities said. (AP Photo/Ben Margot)
Fernando Juarez, 36, of Napa, center, embraces his 22-year-old sister Vanessa Flores, right, at the Veterans Home of California on Friday March 9, 2018. in Yountville, Calif. Flores, who is a caregiver at the facility, exchanged texts with family while sheltering in place. A gunman took at least three people hostage at the largest veterans home in the United States on Friday, leading to a lockdown of the sprawling grounds in California, authorities said. (AP Photo/Ben Margot)
Law enforcement members stage near the Veterans Home of California after reports of an active shooter Friday, March 9, 2018, in Yountville, Calif. Napa County Fire captain Chase Beckman says a gunman has taken hostages at the veterans home in California. (JL Sousa/Napa Valley Register via AP)
Law enforcement members stage near the Veterans Home of California after reports of an active shooter Friday, March 9, 2018, in Yountville, Calif. Napa County Fire captain Chase Beckman says a gunman has taken hostages at the veterans home in California. (JL Sousa/Napa Valley Register via AP)
Vineyards are shown in front of the Veterans Home of California in Yountville. Picture: Eric Risberg/AP
Vineyards are shown in front of the Veterans Home of California in Yountville. Picture: Eric Risberg/AP
Napa County Fire captain Chase Beckman said a gunman took hostages at the veterans home in California. Picture: JL Sousa/Napa Valley Register via AP
Napa County Fire captain Chase Beckman said a gunman took hostages at the veterans home in California. Picture: JL Sousa/Napa Valley Register via AP

Yountville, California - A former US serviceman opened fire at a California veterans home where he had undergone treatment for post-traumatic stress disorder, taking three employees hostage in an all-day standoff that ended when police found him and his female captives dead.

"This is a tragic piece of news, one that we were really hoping we wouldn't have to come before the public to give," California Highway Patrol spokesman Chris Childs told reporters outside the facility in Yountville, a picturesque town located in the heart of Napa Valley's wine country about 60 miles (100 km) north of San Francisco.

Despite repeated efforts by police negotiators to communicate with the suspect throughout the day, authorities said they had failed to make contact with the gunman after he exchanged gunfire with a sheriff's deputy at the outset of the confrontation.

"We credit him (the deputy) with saving the lives of others in the area by eliminating the ability of the suspect to go out and find other victims," Childs said.

Authorities later identified the gunman as 36-year-old Albert Wong, a former patient of Pathway Home, a program housed at the veterans complex for former service members suffering PTSD after deployments in Iraq and Afghanistan.

The San Francisco Chronicle, citing unidentified sources, said Wong, who lived in Sacramento, had been asked to leave the program two weeks ago.

The three hostages all worked for the program. They were later identified as Pathway Home Executive Director Christine Loeber, 48, the program's clinical director, therapist Jen Golick, 42, and Jennifer Gonzales, 29, a psychologist with the San Francisco Department of Veterans Affairs Healthcare System.

"These brave women were accomplished professionals, dedicated to their careers of serving our nation's veterans, working closely with those of the greatest need of attention," Pathway Home said in a statement.

The siege came less than a month after a former student with an assault-style rifle killed 17 people at a Florida high school. That massacre touched off a student-led drive for new restrictions on gun sales to curb mass shootings that have occurred with frightening frequency in the United States over the past few years.

The Veterans Home of California, a residence for about 1,000 aging and disabled U.S. military veterans, is the largest facility of its kind in the United States. The Pathway Home is housed in a separate building on the campus.

LOCKDOWN

The entire complex, its staff and residents were placed under a security lockdown during the siege, which began at about 10:30 a.m. local time (1830 GMT Friday) and ended nearly eight hours later.

Childs said officers who eventually entered the room where the hostages were being held found all four bodies there. He did not elaborate on how the victims or gunman had died.

The incident began when the gunman calmly walked into the Pathway Home building carrying a rifle during a going-away party for one of the employees, according to Larry Kamer, the husband of one of the program's administrators, Devereaux Smith.

Kamer, who volunteers at the home and was acting as an unofficial spokesman for the facility, said his wife told him by telephone during the siege that the gunman had allowed her and three other women to leave the room where the party was taking place, while three female employees remained behind as hostages.

The Napa County sheriff's deputy who confronted the gunman had arrived at the scene within four minutes of the first reports of gunfire, Sheriff John Robertson said.

A resident of the home, identified as Rod Allen by the CBS television affiliate KPIX-TV, said the gunman took the hostages after allowing some people at the party to leave. He fired about 30 shots, the resident said.

James Musson, a 75-year-old Army veteran and resident of the facility, told Reuters many who lived there voiced concerns about lax security, saying visitors could walk in and out without restriction and that public safety officers were not armed. "There might be something that might provide a greater degree of security, I don't know if this event will trigger something like that," he said.