Karti Chidambaram, son of former Union Minister P Chidambaram, has been sent to police custody till March 6 by a Delhi court.

On Thursday, the Patiala House Court granted the CBI 5-day custody, a day after he was arrested in connection with the INX media case. On Wednesday, the court had granted the CBI a day's custody. 

According to Bar and Bench, Karti reportedly spoke to his friend in Tamil, when a CBI official asked him to speak in English. 

"If that is the case, even you should speak in English with each other when I am there," replied Karti.

The CBI official responded saying, "You are in custody, not us."

Karti Chidambaram was arrested at the Chennai airport on Wednesday morning when he returned from London. The INX media case, dates back to 2007. 

The CBI and ED have been probing how INX Media got a clearance from Foreign Investment Promotion Board (FIPB). The CBI FIR also names INX Media directors, Peter and Indrani Mukerjea -- both accused in the Sheena Bora murder case.

According to media reports, Karti Chidambaram and Indrani Mukherjea will be grilled together. 

Karti is facing a probe for his alleged role in facilitating the FIPB's clearance for INX Media when his father was the Union Finance Minister.

Karti allegedly received Rs 3.5 crore from Mumbai-based INX media, now 9X Media, for helping it get the FIPB clearance when it was run by the Mukerjeas.

The ED, which is probing financial misappropriation in the case, has contended that Mukerjeas had "allegedly siphoned off 90 million pounds and the money is suspected to have gone to foreign countries through hawala routes".

Following the FIPB clearance, INX Media said it had received Foreign Direct Investment (FDI) of Rs 46.20 million, but actually received Rs 3,053.60 million between August 2007 and May 2008, the ED said.

Accordingly, this excess foreign exchange equivalent to Rs 3,004.40 million, beyond the disclosed permitted foreign investment, was received by INX Media from three Mauritius-based investors, said the ED.