The Narcotics Control Bureau (NCB) has ordered a vigilance inquiry into the claims made by a witness in the cruise drugs case of an extortion bid of Rs 25 crore by some agency officials, including its Mumbai zonal director Sameer Wankhede, and others for letting off accused Aryan Khan, son of actor Shah Rukh Khan.

The inquiry will be conducted by Gyaneshwar Singh, the NCB deputy director general (DDG) of northern region based at its headquarters here. Singh is also the chief vigilance officer (CVO) of the federal anti-narcotics agency.