At least four people, including a child, have been killed in a shooting at an office building in southern California, US media report.
Police said they were called to the two-storey building on Lincoln Avenue in Orange, south of Los Angeles, at about 17:30 local time (00:30 GMT).
Officers shot and wounded the suspect who was taken to hospital, police said.
The situation has been “stabilised” and there is no threat to the public, the statement adds.
According to police, a fifth victim is in critical condition in hospital. Few other details of the shooting were made available on Wednesday.
“Horrifying and heartbreaking,” said California governor Gavin Newsom on Twitter. “Our hearts are with the families impacted by this terrible tragedy tonight.”
Orange Police spokeswoman Lt Jennifer Amat described the city as “very safe” and “usually quiet”.
Wednesday’s shooting is the deadliest in Orange since 1997, Ms Amat said.
The attack is the third mass shooting in the US in just over two weeks. Eight people were killed inside spas in Atlanta, Georgia, on 16 March. Ten people were shot dead in a Boulder, Colorado, grocery store on 22 March.
President Joe Biden has vowed to take “common-sense steps” to crackdown on firearms, renewing his call to ban assault weapons and urging Congress to pass bills that would end loopholes in background checks.