Half Moon Bay mass shooting updates: Workplace violence believed to be motive

San Mateo County Sheriff Christina Corpus said the department was dispatched at 2:22 p.m. local time with reports of a shooting in unincorporated San Mateo County with multiple victims.

At the first location, four people were found dead with gunshot wounds and a fifth person was taken to the hospital and is in critical condition, Corpus said during a press briefing Monday.

Shortly afterward, three additional victims were found dead at a separate location about a mile away, the sheriff said.

Both locations are nurseries, large rural properties, and some people live on site; children witnessed the shooting, Corpus said. The victims are thought to be workers.

The suspect is thought to be a farm worker, Corpus said.

The motive and the relationship between the victims and the suspect are unknown at this time. The suspect is cooperating and being interviewed, Corpus said.

-ABC News' Marilyn Heck

The San Mateo County Sheriff's Office has identified the suspect as 67-year-old Half Moon Bay resident Chunli Zhao.

The sheriff's office located his vehicle at 4:40 p.m. local time in the parking lot of the Sheriff’s Office Half Moon Bay Police Substation, the department said in a press release.

Zhao was taken into custody without incident, the sheriff's office said, adding that he is believed to have acted alone.

A weapon was found in his vehicle, authorities said.

-ABC News' Alex Stone and Marilyn Heck

President Joe Biden has been briefed on the mass shooting in San Mateo County, White House press secretary Karine Jean-Pierre tweeted Monday night.

"He has asked federal law enforcement to provide any necessary assistance to the local authorities. As more details become available, the President will be updated," she wrote.

-ABC News' Molly Nagle

The San Mateo County Sheriff's Office tweeted that it responded to a shooting incident "with multiple victims in the area of HWY 92 and the HMB [Half Moon Bay] City limits," later adding that a suspect is in custody and there is "no ongoing threat to the community at this time."