Five pupils who subjected a schoolgirl to a savage attack in which she was repeatedly slapped around the face for wearing the wrong school uniform have been punished after video of the assault surfaced on Chinese social media.

In the minute-long video the victim leans against a wall while she is struck more than 10 times by several pupils in turn.

“Should I record you guys?” the girl holding the camera is heard saying, while chuckling at the start of the video. A boy tells her to film the proceedings.

The victim remains quiet throughout most of the ordeal and refuses to fight back.

“You hit her too hard, change to another side,” the girl filming can be heard saying on the footage. The pupil hitting the girl then slaps the other side of her face.

Zheng Chaolong, the deputy principal of Jiangshan Second Middle School, in Zhejiang province, eastern China, told the China News Service that the school had investigated the case and ordered the pupils to apologise.

One of the children received an oral warning and two others were punished for violating school discipline, Zheng said. He did not specify what punishment they had received.

A person at the school office told the South China Morning Post, “We’ve already dealt with this” and hung up the phone.

The five attackers, all in the ninth grade, saw the eighth grade girl not wearing her proper school uniform trousers on December 12, according to the China News Service report..

Two days later, the five pupils found the girl and took her to the attic of the school building. Four pupils struck the girl while the other recorded the incident.

Deputy principal Zheng admitted that the incident had exposed defects in the school’s management and promised to improve the moral education of the students, the China News Service said.

Watch: Chinese schoolgirl smacked repeatedly by fellow students