HALF MOON BAY, Calif. (NEWSnet/AP) — A man accused of killing seven people in back-to-back shootings at two Northern California mushroom farms is now facing charges.

Chunli Zhao, 66, faces seven counts of murder and one of attempted murder.

Authorities believe Zhao acted alone Monday when he entered a mushroom farm where he worked in Half Moon Bay and opened fire, killing four people and seriously wounding a fifth.

He then drove to another nearby farm where he had previously worked and killed an additional three people.

It was California's third mass shooting in eight days.

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