Roy has been visiting Delhi frequently following the CBI summons. Upon his arrival in Kolkata, he assured of his cooperation with the probe agency against which the Mamata Banerjee-led West Bengal government as well as the ruling Trinamool have moved the Supreme Court alleging it was an instrument of the BJP-led central government.

"Today I have returned to Kolkata and like I have reportedly said I will cooperate with the probe agency. I have been asked to appear before the CBI Jan 30, and I will appear before them on that day and participate in the probe," Roy told mediapersons here.

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