New Delhi: In a major development, Ashok Kumar, close aide of Rajendra Kumar, has allegedly admitted taking bribes on behest of Rajendra Kumar.

According to CBI sources, Ashok Kumar on Wednesday confessed to his involvement in accepting huge bribes.

CBI is questioning Rajendra Kumar to find out about his involvement in corruption case.

Also, CBI is trying to find out the money trail and the bribe money.

Earlier, in the day, the Delhi government suspended Chief Minister Arvind Kejriwal's Principal Secretary Rajendra Kumar, as the rules state that an official is deemed suspended if he remains in custody for more than 48 hours.

The CBI court on Tuesday had remanded all five accused, including Rajendra Kumar, to five-day police custody in a corruption case.

The CBI had sought 10-day police custody of Rajendra Kumar and four others in connection with this case.

According to CBI sources, Kumar has been charged with abusing his official position to award contracts to M/s Endeavour Systems Pvt. Ltd. and securing government tenders worth Rs. 9.5 crore between 2007 and 2014 for the company.

Kumar has been booked under Section 120-B of the Indian Penal Code (IPC) and under the provisions of the Prevention of Corruption Act.

The CBI sources said Kumar emerged as the kingpin of the 50 crore scam, which first became active in 2006.

The CBI had in December last year raided Kumar's office at the Delhi Secretariat in this connection.

Kumar had moved an appeal before a special court in March this year seeking the release of his laptop, iPad and cash seized by the CBI.

A trial court had in April also ordered the de-freezing of two bank accounts of M/s Endeavour Systems Pvt. Ltd.

The Delhi High Court had then stayed the trial court's order allowing for de-freezing of accounts of M/s Endeavour Systems Pvt. Ltd.