NCSC member Swaraj Vidwan, who met the family of the victim at Kotkhai yesterday, alleged "gaps" in police probe indicated that there was a conspiracy to save the real culprits.
She claimed that all the people she met were of the opinion that the matter was being hushed up.
Vidwan alleged that the police tried to cover up the case and that all the people she had met were of the same opinion and demanded that the real culprits be brought to the book and punished.
"The death of accused Suraj, a Nepalese national, in police custody further raised suspicion on the role of the policein the entire case," she alleged.
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She questioned how he died when policemen were present in the police station and said that murder charges be slapped on the policemen for the custodial death of an accused.
She alleged that "some top cops and politicians" tried to influence the probe and the real culprits were not arrested at their behest.
"Her parents want speedy justice and they are seeking the arrest of real culprits in the case," she said.
She said now that the case has been handed over to the CBI, shewas hopeful that the culprits would be brought to book.
"I have taken statements of parents of the victims and other persons and would soon submit the report to the central government," she added.
The 16-year-old girlhad gone missing in Kotkhai area here after school hours on July 4 and her body was found in the nearby Haliala forest on July 6.