ST. PAUL, Minn. (AP) — Police say a 16-year-old student attacked a science teacher and the student's 15-year-old brother punched the assistant principal during a fight in the lunchroom at a St. Paul high school.

Police were called to Central High School Friday on a report of an assault. Officers arrived and arrested both of the boys.

The older student is accused of slamming a teacher against a wall, choking him and then slamming him onto the floor after the teacher tried to break up a fight. The younger student is accused of punching the assistant principal when the administrator tried to help the teacher.

Authorities say the teacher suffered a traumatic brain injury.

The 15-year-old was charged Monday with fourth-degree assault and obstructing legal process. Prosecutors Tuesday charged the 16-year-old with felony third-degree assault.