The shooting took place after 10 p.m. (0600 GMT on Sunday) around the location of a Chinese Lunar New Year celebration, U.S. media reported.
Pictures: Twitter, Deutsche WelleTens of thousands of people had attended the festival earlier in the day. About two thirds of residents of Monterey Park a city around 7 miles (11 km) from downtown Los Angeles, are Asian American.
Footage posted on social media showed injured people on stretchers being taken to ambulances by emergency staff. Around the scene of the shooting police guarded cordoned-off streets.
Five of the victims were male and five were female, Luna said. Their identities have not been made public. Another ten people were shot, and seven of them remain hospitalized, with at least one person in critical condition, authorities said.
The massive police operation to hunt down the gunman began when he escaped after killing 10 people at a dance venue in Monterey Park, near Los Angeles, California.
Police teams swarmed a vehicle they believed was tied to the shooter who killed 10 people at a dance venue in Monterey Park, near Los Angeles.
US President Joe Biden has ordered all US flags at public buildings to be flown at half-staff to honour the victims of the mass shooting, the White House said in a statement.
A man inside a vehicle died from a self-inflicted gunshot wound Sunday after engaging police in an hourslong standoff after he was linked to an incident where ten were shot dead in Monterey Park on Saturday night. Police officials said the man inside the vehicle was the man they believed to be the gunman in the Monterey Park mass shooting.
Los Angeles City Controller Kenneth Mejia said in a tweet, Our hearts go out to those who lost loved ones tonight in our neighboring city, Monterey Park, where a mass shooting just occurred.
The tragedy marked the fifth mass killing in the United States this year, according to The Associated Press/USA Today database on mass killings in the US.