Official sources said the CBI grilled Raja on his alleged investments and connections with sure firms based mostly in Chennai and a few alternative cities.
He was confronted with seized documents and asked specific queries based mostly on a similar.
The sources said names of some former bureaucrats have conjointly cropped up throughout the questioning and a lot of arrests are possible to require place soon.
Asked how soon, sources said probably by the February eight as sure info has to be worked on.
Raja along side his former personal secretary R K Chandolia and former telecom secretary Siddharth Behura were conjointly questioned on the last minute changes in spectrum policy that were place in place.
Meanwhile, the agency conjointly questioned former Deputy Director General (Access Control) of DoT A K Srivastava for many hours. Sources said the agency conjointly examined R K Gupta, another DoT official.
Raja, Chandolia and Behura were arrested by the agency on Wednesday and were remanded to 5 days of police custody by a special CBI Court yesterday.
The agency has alleged that the accused conspired with some personal firms in putting a cap on the utmost variety of applications that may well be entertained for the grant of licences.
This was against the recommendations of the TRAI, the telecom watchdog, that the competitive bidding method ought to be most well-liked over the first-come-first-serve basis, it had said within the Court.
"The DoT officers had selectively leaked the data to a number of the corporates relating to the date of issuance of letters of intent on January ten, 2008," it said, adding that as a result, solely few of the businesses were able to deposit the licence fee.
The probe agency had lodged an FIR on October twenty one, 2009 against some unknown persons within the case.
The Enforcement Directorate has conjointly registered a case underneath Prevention of cash Laundering Act (PMLA) and is running a parallel probe.
