The US state of California is reeling from its second mass shooting in days after a man shot dead seven former co-workers south of San Francisco.
The attacks took place in the coastal city of Half Moon Bay. The victims were all Chinese-American farm workers.
Suspect Zhao Chunli, 67, was arrested after driving to a police station.
It comes as the state mourns the death of 11 at Monterey Park - about six hours south east of Half Moon Bay - during Lunar New Year celebrations.
California Governor Gavin Newsom tweeted that he was at a hospital meeting with victims of the earlier mass shooting when he was pulled away to be briefed about the second attack, describing it as "tragedy upon tragedy".