Reddy, a former BJP Minister in the state (2008-11), was on conditional bail since January 2015 in the multi-crore mining scam that rocked Karnataka for a decade (2002-2012).

The CCB had issued a notice to Gali Janardhana Reddy to appear before the trial in connection with the case. Reddy deposed before the crime branch officials in Bengaluru on Saturday.

He was quizzed by Additional Commissioner of Police (crime) Alok Kumar, Deputy Commissioner of Police (DCP) S Girish and Assistant Commissioner of Police (ACP) Venkatesh Prasanna.

Reddy's appearance at the CCB office came a day after a city court on Friday declined to grant him anticipatory bail in the case and adjourned the hearing to Monday.

The inquiry was held till midnight. Reddy denied involvement in the multi-crore Ponzi scheme, but his personal aid Ali khan was arrested after the probe.

The CCB was also on the lookout for Reddy's aide, Ali Khan, who had allegedly struck Rs 18-crore deal with the accused duo -- Syed Ahmed Fareed and his son Syed Afaq Ahmed of Ambident Marketing Ltd, a city-based company that ran the Ponzi scheme and duped about 15,000 investors by laundering their money from Dubai.

Alok Kumar, Additional CP, Central Crime Branch said, "We have taken the decision to arrest him on the basis of credible evidence and witnesses statements. We will produce him before the magistrate. We are going to recover the money & give it to the investors." 

It is likely that the former minister will be taken to the judge's residence in Koramangala after a medical test.