The disturbance began about 5:40 p.m. when fans who tried to attend the premiere of a film about the Electric Daisy Carnival rave were turned away. An official with the Los Angeles Police Department said the event at Grauman's Chinese Theatre was by invitation only, but many tried to crash it.
Officers reportedly began using firing bean bags the crowd of several hundred people when they refused to disperse. Some said there were up to 2,000 people in the street.
"People in the streets, people wreaking havoc, agitated, angry, refusing to cooperate with the officers," LAPD Capt. Matt Blake said. Authorities closed Hollywood Boulevard between Highland and Orange Avenue.
An artist named DJ Kascade was supposed to perform on the back of a truck but was turned away by the LAPD.
"I was there since 4 o'clock. When I got there at 4 o'clock there was five people there and it turned into 2,000 people," music fan Joshua Wheelwright said. "People got really aggravated."
Several people were detained but later released. Police did not immediately say how many people were arrested.
The Hollywood and Highland Metro Red Line station was closed due to the disturbance. Hollywood Boulevard buses are being detoured to Highland and La Brea avenues and Sunset Boulevard, Metro announced.
Supperclub LA asked "for the safety of our community, do not come to Supperclub tonight."
The Associated Press and City News Service contributed to this report.