Seven people were killed and another seriously injured in shootings at two sites in Half Moon Bay, California, according to police on Monday night.

The suspect, a 67-year-old male from Half Moon, is in custody, Dave Pine, President of the San Mateo Board of Supervisors, said.

One shooting occurred on a mushroom farm, and another occurred about two miles away near a trucking facility.

When deputies arrived at the first location, they discovered four people dead and one injured, and three more deceased victims were discovered shortly after, according to San Mateo Sheriff Christina Corpus at a news conference.

Zhao Chunli was named as the suspect by authorities. He was found in his car in the parking area of the sheriff's substation, where authorities said they recovered a semi-automatic weapon, and he was taken into custody without incident.

The shootings' motive is currently unknown. According to the police, the suspect worked alone and is thought to be a staff member at one of the establishments.

The incident follows the weekend's tragic mass shooting in Southern California's Monterey Park, which claimed at least 11 lives.

Numerous aspects of the mass shooting that occurred at Monterey Park on Saturday are still being looked into by authorities.

Los Angeles County Sheriff Robert Luna and numerous other authorities delivered updates Monday, admitting that they still don't know what motivated the shooting at a dance class.

So far, we know that the 72-year-old gunman entered the Los Angeles neighborhood's Star Ballroom Dance Studio and started firing just after a Lunar New Year celebration. According to officials, the man then drove to a second dance club in adjacent Alhambra, where he entered with a pistol but escaped after being disarmed.

When police officers approached the gunman's vehicle on Sunday, he died of a self-inflicted gunshot wound.

"Gun violence has come to our district today and I will do whatever I can to support the San Mateo County Sheriff's Department and Half Moon Bay city officials during this tragic event," Josh Becker, a state representative from the area, wrote on Twitter. "We will continue to monitor this situation. My thoughts go out to all affected."

California Gov. Gavin Newsom tweeted, "At the hospital meeting with victims of a mass shooting when I get pulled away to be briefed about another shooting. This time in Half Moon Bay."

 "Tragedy upon tragedy," Newsom added.

According to the nonprofit group Gun Violence Archive, there have already been 38 mass shootings in the U.S. this year, which is the most in this period in any year on record.