Among the surrendering Taliban forces, Afghan Arabs instigated a prison riot by detonating grenades they had concealed in their clothing, attacking Northern Alliance guards and seizing weapons. The prison uprising (known as the Battle of Qala-i-Jangi) was quashed after a three-day battle, which included heavy air support from U.S. AC-130 gunships and Black Hawk helicopters. One American (Johnny Micheal Spann) was killed and nine were injured, along with about 50 Northern Alliance soldiers. Between 200 and 400 Taliban prisoners were killed during the prison uprising. Two prisoners who were American citizens, Hamdi and John Walker Lindh, were among the survivors.