Ainur Bibi lodged a complaint against her son Najir Seikh at the Diamond Harbour police station in the South 24-Parganas district after rescuing the seven-year-old girl yesterday, a senior police official said.
According to the police, Ainur Bibi came to know about the incident after Nazir talked about it after returning home in a drunk state.
Najir and three others had allegedly raped the Class 1 student when she had gone outside the school to urinate as the school toilet was closed. She was left unconscious near a bush.
"After hearing about the incident, Ainur Bibi rushed to rescue the girl. She took the girl to Diamond Harbour hospital and then lodged a complaint against her son with the police," the official said.
The family members of the girl were unaware of the incident when Ainur Bibi took the girl to the hospital and later reached the police station.