ED has provisionally attached immovable assets worth ₹2.78 crore belonging to ex-Kolkata DCP Santanu Sinha Biswas in a money-laundering case linked to history-sheeter Biswajit Poddar, alias Sona Pappu, and others. The assets include three flats in Kolkata and a plot in Murshidabad. Biswas, arrested in May, is accused of helping a land-grabbing racket in exchange for illegal financial benefits.