The incident occurred late last night when the woman had gone to the guest house to sort out a financial matter with the four accused who were known to her, a police official said.
Instead of returning the money, the four accused sexually assaulted her at the guest house, the official said quoting the woman's complaint.
Three of the four accused, identified as Vikas, Anil and Ramesh have been arrested and a manhunt has been launched to nab the absconding accused.