A Class 11 student, the girl had gone to a park with her friend on Tuesday and was returning home with him at around 9 pm when the gang accosted them. They beat up the girl's friend, then dragged her to a secluded place and raped her, the police said.
They also made a video of the incident.
The girl told her mother about the incident the next day and they filed a police complaint. The police have arrested four accused and are searching for the other two.