According to police, the motivation for the shooting appears to be an altercation that broke out among some of the partygoers:
According to the Star-News the dead woman was identified as Clara Myung Hee Chun, 26, of San Gabriel. Sheriff's officials said three men between the ages of 18 and 30 were also wounded when gunfire broke out at the party in an industrial complex in the 2300 block of Chico Avenue about 2:45 a.m.More here: Rave Shooting: 26-Year-Old Clara Chun Dies At South El Monte Party. The Los Angeles County Sheriff's Department has been following leads, but hasn't made any arrests in the shooting. Anyone who was at the event or who knew anything about the attack is asked to call detectives at 323-890-5900.
Authorities said about 30 people were at the event and that a few -- perhaps "several" -- fights broke out before the shooting occurred. ABC7 reported that two men opened fire and "got away."
Several people had been detained, according to sheriff's officials, and Chico Avenue remained closed Saturday afternoon as authorities investigated.