The NCB and special cell officials joined the dots and raided a godown located in Basai Darapur area of West Delhi on February 15 leading to the seizure of 50 kg of pseudoephedrine that was being concealed in a consignment of multi-grain food mix, and apprehension of three people hailing from Tamil Nadu, Singh said. "The mastermind of the nexus has been identified as a Tamil film producer, who is on the run. Efforts are being made to nab him so that the source of pseudoephedrine can be ascertained," the DDG said.