Seven people have been killed at two locations in related mass shootings in a small Californian coastal city.

Four people were killed at a farm and another three at a trucking business, several miles away, on the outskirts of Half Moon Bay, a city around 30 miles south of San Francisco.

The incidents mark the state’s third mass killing in eight days, following Saturday’s attack at Monterey Park that killed 11 at a Chinese New Year celebration.

Police arrested 67-year-old Chunli Zhao in connection with the latest shootings, after they found him in his vehicle in the car park of a sheriff’s station, San Mateo County Sheriff Christina Corpus said.

Half Moon Bay vice mayor Joaquin Jimenez said the victims included Chinese and Latino farmworkers.

It was not immediately clear how the locations were connected, though it is believed the suspect worked for one of the businesses.

“We are sickened by today’s tragedy in Half Moon Bay,” said Dave Pine, the president of San Mateo County Board of Supervisors.

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“We have not even had time to grieve for those lost in the terrible shooting in Monterey Park. Gun violence must stop.”

Television footage showed officers taking the man into custody, with the San Mateo County Sheriff’s Office tweeting the news just before 5pm local time.

Aerial images also showed police officers collecting evidence from a farm with dozens of greenhouses.

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