The CBI on Friday arrested TMC leader and chairman of Halisahar Municipality Raju Sahani for his alleged role in a ponzi scheme that duped people of lakhs of rupees, an agency official said.

A team of CBI officers conducted raids at Sahani`s residences in Halisahar, on the city outskirts, and New Town here and grilled him for hours in connection with its probe into Bardhaman Sanmarg Welfare Trust ponzi scheme, he said.