Karti was produced before Special Judge Sunil Rana on the expiry of one-day police custody.
Karti's father P Chidambaram and mother Nalini Chidambaram, who are both senior advocates, were present in court and seen talking to him.
Additional Solicitor General Tushar Mehta, appearing for the CBI, said this is not a case of political vendetta and the investigation is in accordance with Article 21 of the Constitution.
"There are very shocking evidences of what Karti did when he went abroad," he said, adding that "when he went abroad, he closed bank accounts in which funds were received".
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Senior advocate Abhishek Mani Singhvi, who is leading a team of lawyers for Karti, contended that in connection with the May 2017 FIR, the CBI has spent roughly 22 hours with Karti in August last year and no fresh summons were issued to him after August 2017 till today which shows the agency has nothing more to ask him.
"There is not an iota of evidence against Karti. He is being arrested despite complying with court orders repeatedly." he said.
Singhvi asked if Karti has done something illegal while being abroad, why didnt the CBI file a contempt petition before the court which allowed him to travel abroad.
The CBI has said that in May 2007, first FIPB approval was given to INX Media and in April 2008, this reference was made in the Finance Ministry.
"We have emails and invoices indicating money was given to Advantage Strategic Consultancy Private Limited (ASCPL), which is related to Karti, around the time period when INX Media received favours.
"There is substantial evidence with the agency which needs to be confronted with Karti. Three mobile phones have been recovered from him which need to be examined. 14 days is the minimum time required to keep him in custody," Mehta contended.