Four men barged into the family's house early morning yesterday, apparently with the intention of committing robbery, but after entering, they confined the girl's father and her nine-year-old brother to a room at gun-point, and three of them raped her.
Later they decamped with Rs 50,000 in cash and gold and silver ornaments, said city superintendent of police V S Raghuwanshi.
A case of gang-rape and robbery has been registered under the Indian Penal Code and further probe is on, he said.