New Delhi, Dec. 29 (PTI): The Enforcement Directorate on Thursday arrested lawyer Rohit Tandon here in connection with a money laundering probe in a case of seizure of Rs 13.6 crore after police raided a law firm as part of ?operations against black money ?after the November 8 demonetisation.

Officials said Tandon, who was being questioned by the ED for the last few days, was placed under arrest late on Wednesday night under the provisions of the Prevention of Money Laundering Act and will be produced in a court here for further custody.

The agency suspects Tandon was allegedly instrumental in the illegal conversion of demonetised currency worth about Rs 60 crore in ?connivance with ?Calcutta-based businessman Paras Mal Lodha and arrested Kotak Bank manager in Delhi Ashish Kumar. 

Lodha and Kumar have already been arrested by the ED apart from two others in Chennai.

The agency has been questioning Lodha and Tandon here and even brought both of them face-to-face. Sources claimed that as the required information was not coming forth from Tandon, he had to be taken into custody.

”Tandon is required for custodial interrogation,” they said.

Tandon's case pertains to an operation of Delhi Police's crime branch and the income tax department earlier this month when the agencies had seized Rs 13.6 crore, of which Rs 2.6 crore was in new currency, allegedly from a law firm here that he is associated with.

The ED had booked a PMLA case against him based on the police FIR.

The lawyer was earlier separately searched by the tax department where it was said that he declared undisclosed income worth over Rs 125 crore to the taxman.

The two cases involving Tandon and Reddy are being probed by at least four lead agencies of the country including the ED, I-T department, the CBI and the Delhi Police.

The Reddy case pertains to Chennai where the Income Tax department has made the biggest detection of unaccounted income of over Rs 142 crore.