The accused, who works as a book seller in the school in Sector Pi, has been arrested, they said.
A police official said that a complaint was made in the case after which the accused man was booked under Indian Penal Code Section 377 for unnatural offence.
The student is from Nigeria, said Girish Kumar Kotiya, the station house officer of Surajpur police station.
Further details were not immediately available.
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