MINNEAPOLIS — A teenager has pleaded guilty to attacking a school principal in north Minneapolis.

The 18-year-old pleaded guilty Friday to assault charges. Since the former student was 17 at the time of the December attack, her case was handled in juvenile court.

The teen will be on probation until she turns 21, and faces an adult sentence if she violates probation. She also was ordered to complete a residential treatment program.

According to court documents, the teen was in the cafeteria at Harrison Education Center when the principal asked her to leave because the teen had been suspended. The teen grabbed the principal by the hair, pulled her to the ground and punched her in the face several times. The principal suffered a concussion.

Harrison serves students with behavioral and emotional needs.