The crowd appeared to come from Thrasher Magazine's "Halloween Hell Bomb" skater event.
Officers responded to the scene after being called by the L.A. Department of Transportation when the large crowds began to flood the streets near Grand Park, according to LAPD.
LAPD says that when officers arrived, the crowd started throwing rocks and bottles. Police called for backup and formed a skirmish line. They were able to disperse the crowd using less lethal rounds.
During the incident, a Waymo car got stuck in the middle of the crowd and was damaged, LAPD said.
At least one person was arrested.
No further details were immediately known.
This is a developing story. This article will continue to be updated as more information becomes available.