New Delhi (Agencies): Making a major headway into the 2G spectrum allocation probe, CBI (Central Bureau of Investigation) on Wednesday quizzed Reliance Communications head Anil Ambani for more than three hours at its headquarters here.

Ambani's visit pertained to the agency seeking clarification on certain documents relating to Swan telecom. Anil Ambani was questioned in the wake of Supreme Court’s rapping up of the CBI in the 2G spectrum scam.

The Reliance Infocomm had 9.9 percent equity in Swan Telecom before Swan applied for new licence for 2G spectrum.

Swan was promoted by DB Realty group headed by Shahid Usman Balwa, who is currently in CBI custody.

The CBI is probing the financial trail between Swan Telecom and DMK owned Kalaignar television.
An ADAG statement said, "during the course of his weekly visit to New Delhi, Ambani "met CBI officials on Wednesday to clarify ongoing issues, relating to telecom matters for the years 2001 to 2010, and virtually every telecom operator in the country".

It said no summons of any kind have been issued by CBI to Ambani.

The ADAG statement said, "neither Relinace Telecom nor RComm nor any Reliance ADA Group individual, company or affiliate held even a single share in Swan Telecom Ltd at the time of grant of the 2G licence to them in january, 2008, or at any time thereafter".