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A 12-year-old girl is fighting for her life after she was allegedly gang raped by a headmaster and three teachers.

The girl, who is believed to be mentally challenged, is in a critical condition in hospital after the alleged attack.

The attack is said to have happened at a school in the city of Kako in the eastern Indian state of Bihar, where she is a regular visitor but not a pupil.

She was discovered in a "disheveled" state on the rooftop of the school , RT reports.

Police said that a rape accusation has been launched against Aju Ahmad, the principal of Kako secondary school, and three teachers, Atul Rehman, Abdul Bari, and Mohammed Shaukat.

(Image: CEN)

The girl's mother told the Indian Express that she came to work with her as she "is not mentally sound" and needed supervising.

Her mother was teaching a physical education class when the alleged assault took place.

She said: "When I did not find her for some time, I started looking for her and reached the rooftop. She was found in a bad condition there."

The little girl was taken to Kako police station and on to Jehanabad Sadar hospital.

But her condition worsened and she was taken on the train to Patna Medical College and Hospital.

She is still in a critical condition and the suspects are on the run, according to RT.com.