P Chidambaram's CBI custody has been extended for four more days, a Delhi court ruled on Monday. The order came after the CBI sought a five-day extension, arguing that the Congress leader was "uncooperative" during his interrogation in custody after his arrest last Wednesday in a corruption investigation. Mr Chidambaram, who was produced in the court, faced a setback earlier in the day after the Supreme Court refused to take up his petition requesting protection from arrest by the CBI - filed on Wednesday - saying it was "infructuous" now as he had since been arrested.