Official sources said today that investigators have also seized cash and jewellery from the accused officer's bank lockers.
Following thorough searches at several places in Jaipur and Kota, ACB officials unearthed that Singh possessed huge properties, cash and jewelleries, the sources said.
Singh had been sent to police custody for five days yesterday, along with a couple who had aided him, by a court in Kota.
Singh other assets were being assessed and verified by the ACB investigators, they said, adding that his two lockers were also opened with huge cash and jewellery.
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In a locker opened yesterday, ACB seized Rs 1 lakh in cash and gold and silver jewelleries worth Rs 10 lakh.
Singh was arrested by ACB sleuths for allegedly accepting bribe to change a charge sheet in favour of a client, through the couple in Kota on May 27.
A property dealer, Abdul Mateen, had filed a complaint with the ACB, alleging that the SP had demanded a bribe of Rs 2 lakh from him for changing the charge sheet in a case, the ACB DG Manoj Bhatt said.
Mateen had paid Rs 1 lakh to the Khans earlier and handed over Rs 50,000 in cash to them on the day of raid. He was to pay the remaining amount after the completion of work.
A case under relevant sections of the Anti Corruption Act, and 120 B of the IPC for conspiracy was lodged against the three accused, Bhatt said.