Chinese authorities are investigating a classroom brawl between high school students and their teacher in Anhui province, according to local media.
A video purportedly showing the fight spread online yesterday, shocking many who condemned the incident.
The clip shows a teacher grabbing a student's neck, and a group of students beating and kicking the teacher.
Classroom violence is rare in China, which has traditionally emphasised respect for teachers.
Anhui News said the principal of the school had been suspended, while the students and teacher are being questioned.