Four dead in California office shooting

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A shooting at a southern California office building has killed four people, including a child, and injured a fifth person before the suspect was shot.

Shots were being fired as officers arrived at a two-storey building in Orange, southeast of Los Angeles, at about 5.30pm on Wednesday, police Lieutenant Jennifer Amat said.

"An officer-involved shooting occurred" and the suspect was taken to a hospital, Amat said. It's unclear who shot the suspect, who is in a critical condition. The victims included a woman who was wounded and also in critical condition.

The shooting was on the second floor of the building, Amat said. Media reports said bodies could be seen on the building's second-floor walkway and in a courtyard.

Amat had no details about the confrontation, what may have sparked the attack or why a child may have been at the building. Signs outside indicated a handful of businesses were there, including an insurance office, a financial consulting firm, a legal services business and a phone repair store.

The situation was stabilised by 7pm and there was no threat to the public, police said.

In a tweet, Governor Gavon Newsom called the killings "horrifying and heartbreaking".

The killings were the latest mass shooting in the United States in the last two weeks. Ten people were killed in a Boulder, Colorado, supermarket last week and eight people were fatally shot - including six Asian women - in three Atlanta-area spas the week before that.