An 18-year-old University High School student was arrested Friday after campus security found a loaded gun in his backpack, according to police.
Police said the weapon was discovered while the student was being treated after an assault.
There was no indication of intent to use the weapon or threat of violence, police said.
The student, identified as Nicholas Baker, was arrested and expelled. He is facing charges of carrying a pistol without a permit and possession of a weapon on school grounds.
Baker was held on a $25,000 bond.