A 15-year-old Tucson boy who brought a gun to Pueblo Magnet High School is facing several charges and expulsion after the firearm accidentally discharged in a bathroom stall Friday.

Around 10:30 a.m. a school monitor heard a shot fired in the bathroom and when the boy came out, he was escorted to the office and police were called, said Sgt. Maria Hawke, a Tucson Police Department spokeswoman.

Nothing was seriously damaged, and nobody was hurt when the gun went off, Hawke said.

School officials retrieved the weapon and held the teen until police arrived at the south-side campus, 3500 S. 12th Ave., said Cara Rene, a Tucson Unified School District spokeswoman.

"We believe he was playing with the handgun, and it accidentally discharged," Rene said. "The weapon was not being pointed at anyone or anything."

One other student was in the bathroom at the time, but he was not involved.

The boy faces one count each of weapons misconduct for having a gun on a school campus, weapons misconduct for being a prohibited possessor and discharging a firearm within city limits, Hawke said.

His case is being handled by Pima County Juvenile Court, she said. The boy's name was not released.

Due to the severity of the incident, the boy was automatically suspended and faces an expulsion hearing. The Governing Board will determine whether he can return to a TUSD school.

A letter was sent home to Pueblo parents Friday, Rene said.

"We're just grateful no one was hurt and that the monitors and school safety responded immediately and contained the situation quickly," Rene said.