Delhi Police's chief spokesperson Taj Hassan said, "Unfortunately this case is now being politicised. We are investigating the case without any pressure or bias. We have taken all relevant documents from NDMC. The allegations being levelled through certain section of the media are baseless."
Earlier in the day, Aam Aadmi Party alleged that Lt Governor Najeeb Jung's role in Khan's case was "suspicious" and demanded action against him.
It has come to light that a day after Khan was murdered for allegedly refusing to take bribe from hotelier Ramesh Kakkar, Jung's office purportedly sent his (Kakkar's) petition against the officer to NDMC asking for taking "action as per law".
"The investigation is being done without any bias. With the arrest of all the accused persons in the case we have recovered the weapon of offence, vehicle used and money given to the contract killers," Upadhyay said.
"Girri and Tanwar have no role in the case. All relevant letters and documents have been taken from NDMC," he added.
Khan, the Estate Officer of New Delhi Municipal Council (NDMC), was shot dead on May 16 in Jamia Nagar, a day before he was to pass the final order on the lease terms of hotel The Connaught which was functioning on a property of the civic body.