New Delhi: Former finance minister and senior Congress leader P Chidambaram reached the Enforcement Directorate office on Monday morning after the law enforcement agency sent him a notice to re-join the investigation of the INX Media case. 

The ED had grilled Chidambaram last year as well. On December 19, the ED grilled the Congress leader for almost eight hours in the case filed by the agency and the Central Bureau of Investigation. 

The Delhi high court also extended the protection from arrest granted to the Congress leader on his pleas seeking anticipatory bail till January 15. 

According to reports, the ED wanted to know about the Foreign Investment Promotion Board (FIPB) clearance when Chidambaram was the finance minister.

The central probe agency had already probed and questioned Chidambaram's son Karti Chidambaram and attached his assets worth Rs 54 crore, located in India and abroad. Karti was arrested by the CBI on February 28.

The ED had registered a Prevention of Money Laundering Act (PMLA)  case on the basis of the FIR filed by the CBI.  

The FIR said that irregularities took place in the FIPB clearance to INX Media for receiving overseas funds to the tune of Rs 305 crore in 2007 when Chidambaram the finance minister.

The ED had registered an Enforcement Case Information Report (ECIR), the ED's equivalent of a police FIR, against the accused named in a CBI complaint, including Karti, INX Media and its directors Peter and Indrani Mukerjea.