Continuing its grilling of corporate honchos, the Central Bureau of Investigation (CBI) on Thursday questioned at least seven of them in connection with its ongoing probe into the 2G spectrum scam. The CBI called R.K. Krishna Kumar, who heads the Tata Realty and Infrastructure Private Ltd., to its headquarters here and quizzed him for nearly six hours. Mr. Kumar is also a board member of Tata Sons. Tata Realty Managing Director Sanjay...

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