At least 10 people have been killed and 10 injured in a mass shooting east of Los Angeles following a Lunar New Year celebration that attracted thousands, police said.

Police said the shooting, which took place late on Saturday, occurred at a ballroom dance club on Garvey Avenue in Monterey Park.

Captain Andrew Meyer of the Los Angeles Sheriff’s Department said people were “pouring out of the location screaming” when officers arrived at the venue around 10:30pm (06:30 GMT Sunday).

The male suspect is still at large, said Meyer, who could not immediately offer a description of the alleged attacker or the weapon used.

Meyer said it was too early in the investigation to know if the gunman knew anyone at the ballroom or if it was a crime motivated by hate. He also said police were investigating another incident in the nearby city of Alhambra to see whether it was connected.

“We will look at every angle,” he said.