A teenage girl was killed during a crowded car meet on Hollywood Boulevard and Highland Avenue around midnight, LAPD said.
Videos posted online show three men attacking a fourth before gunshots heard prompt the surrounding crowd to flee.
Los Angeles police have arrested the suspected shooter before noon Sunday, said LAPD Officer Mike Lopez.
The 17-year-old victim was struck by gunfire and pronounced dead at the scene, LAPD said.
Multiple sources only claim the girl was hit in the head, although this information has yet to be confirmed.