A man was arrested on weapons charges after warning police he had a gun hidden between his buttocks.
Marco Alvarado, 20, told officers about the gun as they responded to reports of gunfire.
It happened in the 4300 block of North Pulaski on the city’s Northwest Side.
Police found Alvarado hiding in a car, and he told them he hid a gun down the back of his pants.
He said he fired the shots to protect a friend who was attacked by some other men.
Alvarado is being held on $20,000 bond.