In the latest outbreak of violence at Bartram High School in Southwest Philly, a substitute teacher received a concussion from a student last week.
The assault, which was videotaped and posted on social media, occurred on Thursday, the Inquirer reported, when a student attacked a 68-year-old substitute teacher who had asked him to leave a classroom earlier in the day.
It's the third attack on a teacher in the past month at the school.
In October, one teacher was punched in the face and another was struck by a student in separate incidents.
In March, a teacher was injured after a student slammed him into a wall.
School officials told the Inquirer that they would suspend the student responsible for the latest attack and seek expulsion.
The student may also face criminal charges. The student's age or grade were not immediately available.
Watch a Vine of the aftermath of the assault below.