DGP Y P Singhal along with other senior officers of police visited the spot today and made the announcement of raising the amount of reward money for the person providing information to police.
"We have been able to get certain leads in the case," he said while asserting that these could not be divulged to media.
Haryana ADGP Law and Order Mohammed Akil had yesterday visited the crime spot and held confabulations with the members of the SIT and other senior police officers.
He said police had got "vital clues" in the case and the culprits will soon be arrested.
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A 28-year-old mentally-challenged woman from Nepal was brutally raped and murdered and her body dumped in a field at a village on the Rohtak-Hisar Highway here.
The victim had been residing with her sister for the past three months and was undergoing treatment at the Post Graduate Institute of Medical Sciences (PGIMS) here.
On the issue of alleged police inactivity in the case, the DGP said they swung into action the moment complaint was lodged and a DSP rank officer is himself working on it.
"If, however, any lapse on the part of police officials is found, action will be taken as per law against them," he said.
Meanwhile, activists of different social organisations, including Nepali, met the Deputy Commissioner here seeking justice for the family members of victim.
Meanwhile in a related development, Congress Legislative Party (CLP) leader in assembly, Kiran Choudhary, along with her flock met state governor Kaptan Singh Solanki in Chandigarh over the issue.
The Congress delegation apprised the governor about "lawlessness" in the state.
The post-mortem report of the woman mentioned several injuries on her private parts, doctors of PGIMS said, adding that stones and blades were also found in her body.