MARTINEZ (CBS SF) — A 13-year-old boy who stabbed a student in the locker room of a Martinez middle school Thursday morning turned himself in to school staff, police said.

Police and emergency medical personnel responded at 11:14 a.m. to the Martinez Junior High School on a report of a stabbing, police said.

A 13-year-old boy stabbed an 11-year-old boy with a knife in an apparently unprovoked attacked, police said.

The students were in the locker room during P.E., or physical education class, at the time of the attack, said Sue Casey, an executive assistant to the Martinez Unified School District superintendent.

The suspect left the immediate area of the incident and reported what he had done to school staff, police said.

He was taken into custody without incident and police said he was booked in juvenile hall on suspicion of assault with a deadly weapon.

The 11-year-old victim was airlifted to a trauma center with a stab wound to his back. Police said his injuries do not appear to be life threatening.

Casey said the district called counselors from other campuses to the junior high school to provide support to students. She advised that the area is safe and parents should not come to pick up their children.

She said the district would release further information on its website

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