She confronted him one day, Sergeant Burns said, and he stopped.
Sergeant Burns said both sites were regarded by the police as "known drug locations."
Sergeant Burns said the 11-year-old never fired the gun and failed to collect his money.
Sergeant Burns said officials at the school "really don't know where he got it."
The cause of the fire is under investigation, Sergeant Burns said.
"A man approached who was known to both of them," Sergeant Burns said.
The cause of death was not apparent, said Sergeant Burns.
Sergeant Burns said 163 people were arrested at that site.
Sergeant Burns said no weapon was found in his pocket.
Sergeant Burns said one of the pellets struck the girl in the eye.