The CBI has examined Punjab National Bank’s Managing Director and CEO Sunil Mehta and its Executive Director K V Brahmaji Rao in connection with the Rs 11,400 crore PNB scam allegedly involving diamantaire Nirav Modi and owner of Gitanjali Gems Mehul Choksi.This is the first time the agency has examined the top brass of the Punjab National Bank in connection with the fraud, which remained undetected state for over six years, shaking up the banking system of the country.The CBI has so far arrested 12 accused in the case.