"A search operation is going on at the Diamond Harbour Road office of Saradha group," a senior official of the directorate told PTI.
Earlier, the ED had initiated probe into the Saradha scam and interrogated its owner Sudipta Sen, his wife Piyali and son Suvojit.
The directorate had attached several bank accounts and shares held in their names.
The probe is being conducted under the Prevention of Money Laundering Act.