A man impersonating a Customs officer allegedly duped a passenger and fled with a gold necklace worth ₹12 lakh at Chennai airport on Tuesday night. The woman was carrying a gold necklace in an envelope. Realising that they had been deceived, Nandagopal alerted Customs officials and personnel of the Central Industrial Security Force (CISF). Officials confirmed that no Customs officer had intercepted or seized any jewellery from the passengers. Efforts are under way to identify the suspect using CCTV camera footage from the airport terminal.