The Mumbai Police on Tuesday said they have received four applications so far alleging extortion by Narcotics Control Bureau's (NCB) Mumbai zonal director Sameer Wankhede and other officials, and have launched a probe to verify these claims. A preliminary inquiry has been initiated by Mumbai Police against Narcotics Control Bureau (NCB) Zonal Director Sameer Wankhede after an independent witness in the drugs bust case leveled allegations of extortion against him. Watch what are the other allegations on Sameer Wankhede.