Former union minister P Chidambaram -- who was questioned for three hours today at the Central Bureau of Investigation headquarters -- was produced in court today. The agency has asked for five days' custody for his interrogation, claiming that he is not cooperating with the investigation. Calling attention to the "enormity and gravity" of the offence, the CBI pointed out that the Delhi High Court rejected the former minister's pre-arrest bail. Serious offence of money laundering of monumental magnitude won't be unearthed unless custodial interrogation is given, the agency argued.