A 67-year-old suspect is in custody, authorities said.
Seven people were killed on Monday in a mass shooting at two locations in Half Moon Bay, California, authorities said.
One person was also taken to a hospital with life-threatening injuries, according to the San Mateo County Sheriff's Office.
The suspect, 67-year-old Chunli Zhao, is in custody. Workplace violence is believed to be the motive, authorities said.
This is the state's second mass shooting in three days.
San Mateo County Sheriff Christina Corpus said a semi-automatic handgun was found in the suspect's car.
The suspect, 67-year-old Chunli Zhao, is cooperating and being interviewed, the sheriff said.
Zhao is believed to have acted alone, Corpus said.
-ABC News' Marilyn Heck and Abigail Shalawylo
The gun violence in the U.S. is at "completely unacceptable levels," and it "really hit home tonight," San Mateo County Board of Supervisors President Dave Pine said Monday. "Our hearts are broken."
"But in the end, there are simply too many guns in this country," Pine said. "And there has to be a change. This is not an acceptable way for modern society to live its conduct its affairs."
-ABC News' Marilyn Heck and Abigail Shalawylo
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
