According to US media reports, police in California are responding to a shooting that has injured several people.
The incident occurred after 22:00 p.m. local time on Saturday in Monterey Park, about eight miles (13 kilometers) east of Los Angeles (06:00 GMT on Sunday).
Earlier in the day, thousands of people had gathered in the city for the Monterey Park Lunar New Year festival.
It is unclear how many people were shot or if anyone was killed.
Social media videos showed a large police presence in the area.
The annual Lunar New Year festival is a weekend-long event that has drawn crowds of over 100,000 visitors in the past.
The festivities on Saturday night were scheduled to end at 21:00 local time.