Six suspects accused in the gang rape of a 15-year-old girl on a California high school campus entered not guilty pleas Tuesday, police said.
A seventh person who had been arrested was released for lack of evidence, said Richmond Police Lt. Mark Gagan.
A date will be set on January 21 for a preliminary hearing, the Contra Costa County district attorney's office said.
Police say as many as 10 people were involved in the October 24 incident, which occurred in a back alley outside Richmond High School, where a homecoming dance was taking place.
Another 10 people watched the attack, which lasted more than two hours, without calling 911, police say.