Rohtak, Feb 09 (ANI): Haryana Police is investigating the site of alleged gangrape and murder of a mentally challenged woman in Rohtak. DGP of Haryana, YP Singhal said that investigation of the case is underway and police will leave no stone unturned to nab the guilty. He added that the reward money has been increased from Rupees 1 lakh to 5 lakh.