RICHMOND, Calif. —  A seventh suspect has been arrested in connection with the gang rape of a 15-year-old girl outside a California high school homecoming dance.

Richmond Police Lt. Mark Gagan says a 21-year-old man was arrested Tuesday morning on suspicion of rape, rape in concert with force and other charges that could lead to life in prison if convicted.

Prosecutors have filed charges against five others in the case, including 18-year-old Jose Carlos Montano.

One of the suspects, 21-year-old Salvador Rodriguez, was released after prosecutors said there's not enough evidence to charge him.

Gagan says authorities are looking for more suspects. Investigators believe as many as 10 people participated in the Oct. 24 assault, and several others watched.