The accused, Peter, 21, has been arrested on a complaint from the girl’s parents, they said, adding that he was on Saturday produced in a local court which remanded him to judicial custody.
The incident, occurred on May 3 during a summer camp organised by the school, came to light when the girl complained of pain after returning from the camp.
The girl’s parents took her to a clinic where the doctors confirmed sexual assault and a second opinion in a hospital also confirmed it, police said.
The girl narrated her ordeal and named Peter as the person who sexually assaulted her, police said, adding subsequently, the parents lodged a complaint against him, following which he was arrested.
The accused confessed to his alleged crime during interrogation, police said.
Peter has been arrested under the Protection of Children from Sexual Offences Act and remanded to judicial custody by a court, police said.