The incident took place last night when the woman had gone to a Dussehra fair in Sahabganj area following which she was gang-raped by two persons, who held her husband captive, Additional Superintendent of Police Jiya Lal Yadav said.
He said that the accused are friends of the victim's husband.
The woman alongwith her husband lodged a complaint at the SP's office today, Yadav said.
On their complaint, a probe has been ordered and an FIR registered at Sahabganj police station, he said.