The sanction required to prosecute former Union Minister P Chidambaram in the Aircel-Maxis case has been obtained from the authorities concerned, the CBI told a court.

The court, which further extended the protection from arrest to Chidambaram and his son Karti till December 18, also granted three weeks to the agency to get sanction against some other accused in the case. Special Judge O P Saini posted the matter for December 18.