The incident came to light after the girl escaped and lodged a police complaint on Sunday.
As per reports, one Purna was in relationship with the survivor for past one year. He lured the girl to Udala on Wednesday on the pretext of marriage and locked her in an abandoned house in the area.
On May 3, Purna took the girl to Udala where he and his two other friends, Chandan and Tuna, allegedly gangraped her. Later, three more friends of the accused joined them in the crime, said Srinibas Martha, sub-inspector of Udala police station.
The police have registered an FIR in this connection and sent the victim for medical tests. "Investigation into the incident is on and further investigation into the incident would be carried out on the basis of the report," added Martha.