Substitute teacher attacked at Bartram HS in SW Phila.

SOUTHWEST PHILADELPHIA (WPVI) -- A video posted to social media shows a teacher who'd been attacked by a student at Bartram High School in Southwest Philadelphia.

The incident, which involved a substitute teacher, happened on Thursday.

The teacher suffered a concussion and the student is suspended and facing expulsion.

Bartram High has been plagued by similar incidents.

In March, a student knocked a school staffer unconscious.

A new principal took over the school in the fall, trying to enhance security.