The matter came to light after the victim, a class seven student, had narrated the sequence of incidents to her elder sister, who later brought this to the notice of their parents, following which a complaint was lodged, senior police officer told PTI.
"A complaint was registered by the mother alleging that the girl was sexually assaulted by around 15 people on various days in various places inside the apartment campus", the official said adding that the investigation has begun.
No arrests have been made yet, the policeman added. "We are interrogating people. The girl will be taken to hospital for health check-up," the official added.