CBI sources said Bose was interrogated for more than three hours.

It was his first visit to the CBI office after getting bail.
He was given bail by the Alipore district sessions and judges court on February 4 on the conditions that he would appear before the CBI whenever called for interrogation and would not leave the country.

Bose had resigned from TMC and also as its Rajya Sabha MP a day after he was released.

He had spent 75 days in CBI and judicial custody after his arrest by the central investigating agency in connection with the scam in November.

"I would like to inform that with immediate effect, I have resigned from my membership of the Rajya Sabha. I have also decided to resign from the primary membership of the party - the Trinamool Congress," he had said in a release.

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