Industrialist Anil Ambani on Wednesday appeared before the CBI in connection with the probe in the 2G scam. He remained with the agency officials for nearly two hours at the CBI headquarters.AIR correspondent quoting sources reports, CBI was seeking clarification on certain documents relating to Swan Telecom from Anil Ambani, who is ADAG Chiarman and Reliance Infocomm Chief. Reliance Infocomm had 9.9 per cent equity in Swan Telecom before Swan applied for new licence for 2G spectrum. Swan Telecom was promoted by DB Realty group headed by Shahid Usman Balwa, who is at present in CBI custody.The CBI is probing the the financial trail between Swan Telecom and DMK owned Kalaignar television.However, an ADAG statement said, neither Relinace Telecom nor RCOM 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.