The CBI today questioned the top officials of some telecom companies, including Managing Director of Unitech Sanjay Chandra, in connection with its probe into 2G scam. The others questioned today by the premier investigating agency include Chief Executive Officer of Loop Telecom Sandeep Basu, Chief Financial Officer Arun Mandhana and Chief Regulatory officer Rajeev Sikka of S-Tel, a company which was issued licenses in five circles during the same period. Tata Realty Managing Director Sanjay Ubale and Kishore Salatore were also quizzed by the CBI.