NEW DELHI: After 55 days of CBI and judicial custody, the Enforcement Directorate (ED) on Wednesday arrested former finance minister P Chidambaram for custodial interrogation in the INX Media money laundering case. Chidambaram, who is in Tihar Jail , will be produced on Thursday before a special court which will decide the period of his ED custody.Top sources in the agency claimed they will question the senior Congress leader on the "fresh evidence" allegedly linking Chidambaram and his family members to undisclosed properties acquired abroad through shell companies registered in tax havens. These assets are in addition to the Rs 54 crore worth of properties and bank deposits the agency attached in the UK, Spain and India in the INX Media case , sources said.The ED urged the special court to remand the former FM in its custody for 14 days. The court said it will take up ED's remand plea on Thursday when the politician's judicial custody in the corruption case filed by the CBI expires. The ED had earlier claimed that Chidambaram and his son, Congress MP from Sivaganga (Tamil Nadu) Karti Chidambaram , had put in shell companies the bribes extorted in return for the undue favours allegedly granted by the former finance minister.On October 9, the agency had grilled Karti Chidambaram at the ED headquarters in the national capital when he was asked to substantiate the transactions of the shell companies and the source of money used to purchase properties in several countries.Chidambaram Senior had failed to get a stay on his arrest last month when the Supreme Court rejected his pre-arrest bail application in the ED's INX Media case.The court, while rejecting his plea, had observed that his custodial interrogation was necessary and releasing him on bail would hamper investigations.ED sources said Karti, during his questioning last week, was evasive and dissociated himself from the shell companies the agency had "evidence" to link him to. He has sought more time for further appearance before the investigating officer. Just before Karti's interrogation, the ED had questioned KVK Perumal, former secretary of P Chidambaram, and S Bhaskararaman, the chartered accountant of Karti Chidambaram, and his wife Padma Bhaskararaman.Perumal and Bhaskararaman are believed to have been privy to a lot of undisclosed and benami assets allegedly acquired by Karti in India and abroad through shell companies, many of them operated by Bhaskararaman through his wife and brother-in-law Ravi Visvanathan, the agency had earlier claimed.Bhaskararaman had also executed the sale deed of P Chidambaram's Jor Bagh residence worth over Rs 16 crore. The property has been attached by the agency in the INX Media case. Bhaskararaman was arrested by the ED in February last year and is currently out on bail.Bhaskararaman was a shareholder in Advantage Strategic Consulting Pvt Ltd. All the directors and shareholders of ASCPL, including Bhaskararaman, had written a will bequeathing their shares to Karti's daughter Aditi. The identical wills were later recovered by the ED from Karti's Chennai office. Both Karti and his father have consistently denied any association with ASCPL.