The incident took place late last night when the family, while returning from its field, was overpowered by the accused hiding in a jungle, it said.
The accused tied the victim's husband and son and gangraped her. They assaulted the family members on resistance, police said.
The medical report of the woman today confirmed rape.
Senior Superintendent of Police J Ravindra Gaud said an FIR has been lodged against 10 persons in this connection.