CBI today examined UB Group Chairman Vijay Mallya in connection with its probe into alleged loan default of 900 crore rupees taken from IDBI bank. The sources said Mallya was called to agency Headquarters in New Delhi in connection with the case where the team of Banking Securities Fraud Cell carried out his detailed questioning.CBI has registered a case against Mallya, Director of defunct Kingfisher Airlines, A Raghunathan, Chief Financial Officer of the Airlines, and unknown officials of IDBI Bank. It is alleged that the loan was sanctioned in violation of norms regarding credit limits.