HALF MOON BAY, Calif. — An agricultural worker killed seven people in back-to-back shootings at two mushroom farms that had employed him in Northern California and the massacre is believed to be a “workplace violence incident," officials said Tuesday as the state mourned its third mass killing in eight days.

Officers arrested 66-year-old Chunli Zhao on Monday after they found him in his car in the parking lot of a sheriff’s substation, San Mateo County Sheriff Christina Corpus said.

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