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.