Karti Chidambaram raises his fist as he is produced by CBI in the INX Media case, at Patiala House Court in New Delhi. Pic/PTI

Karti Chidambaram, the son of senior Congress leader P Chidambaram, will undergo three more days of custodial interrogation in the INX Media corruption case with a Delhi court on Tuesday extending his CBI custody. The agency, which produced Karti before special judge Sunil Rana after his five-day police custody expired, said an extension was needed, as there were "new revelations". Further custodial interrogation was necessary to confront him with "new facts", it added.