There was an armed standoff with police,[8] who lobbed tear gas canisters at the building. The MOVE members fired at them in return, and a 90-minute gunfight ensued, in which one officer was bruised in the back by gunfire.[38] Police used more than ten thousand rounds of ammunition before Commissioner Sambor ordered that the compound be bombed.[38] From a Pennsylvania State Police helicopter, Philadelphia Police Department Lt. Frank Powell proceeded to drop two one-pound bombs (which the police referred to as "entry devices"[37]) made of FBI-supplied Tovex, a dynamite substitute, targeting a cubicle on the roof of the house.[35] The ensuing fire killed eleven of the people in the house (John Africa, five other adults, and five children aged 7 to 13). The fire spread and eventually destroyed approximately 65 nearby houses on Osage Avenue and nearby Pine Street. Although firefighters had earlier drenched the building prior to the bombing, after the fire broke out, officials said they feared that MOVE would shoot at the firefighters, so held them back.[35][38][39]