Police are attending a shooting in Monterey Park, California, with multiple casualties, the Los Angeles Times reports.
The shooting took place after 10pm (0600 GMT) near a Chinese Lunar New Year celebration in Monterey Park, the newspaper said, citing local law enforcement.
It was not clear how many people had been injured or killed, or if the suspect was still at large.
Tens of thousands of people had attended the festival earlier in the day.
Footage posted on social media showed emergency staff treating casualties on the scene and police guarding cordoned-off streets.
The LA Times quoted the owner of a nearby restaurant as saying that people who sought shelter in his property told him there was a man with a machine gun in the area.
Seung Won Choi told the newspaper he believed the shooting took place at a dance club.
Monterey Park is a city in Los Angeles county, about 11 kilometres from downtown Los Angeles.
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