Rakesh Kumar, a resident of Punaichak here, had lured her to Patna with a promise of providing a job to her.
Soon after she came here, Rakesh forced her to have sex with his friends. She ran away from the hotel where she had been staying with him for the last few days. However, Rakesh and his friends caught up with her and attacked her.
Police have arrested Rakesh, who is said to be involved in the flesh trade.
'Police have lodged a case against Rakesh and others on the basis of the statement of the woman,' an official said.
The state women's commission has asked Patna Senior Superintendent of Police R. Mallar Vizhi to submit a report on the incident.
Rashtriya Janata Dal (RJD) chief Lalu Prasad condemned the incident and said that it shows that no government existed in the state.