After being beaten and allegedly raped by several men on the Richmond High School grounds after a homecoming dance, a 15-year-old girl remains hospitalized this morning. The incident happened on Saturday night. According to reports:

Officers responded to Richmond High School at 1250 23rd St. just before midnight, about an hour after the dance ended, and saw several males running away, Richmond police Sgt. Bisa French said.

The officers then found the victim unconscious and suffering from "different injuries indicating she had been assaulted," French said.

It seems the victim left the dance, which is when the assault began, in an alley on the school grounds. According to KRON 4, the attacked lasted at least an hour with passersby joining in the attack or watching as it happened. So far, only one 19-year-old man has been arrested in connection with the attack. Police are looking for "at least a dozen" men, boys, students, and non-students who aided in the attack

KTVU says that the attack was videotaped with cellphones.

“'At one point there were four individuals who were physically assaulting our victim - she was raped, she had been robbed. We are working backwards to identified the other individuals,'" Lt. Mark Gagan said. "'Throughout the incident, several people walked by, heard a commotion, came over and saw what was going on and either observed or left, but did not report what was going on. To me, that is the most disturbing part of this.'"

SFist left a message with Richmond High School Principal Julio Franco for comment and answers about his school's security, or lack thereof. We have yet to hear back from him.

Those who know of someone who participated in the attack should call Richmond police at 510-233-1214.