Kochi (Kerala), July 27 (ANI): M Sivasankar, who is the former principal secretary of Kerala Chief Minister reached National Investigation Agency (NIA) office in Kochi for interrogation on July 27. NIA had issued notice to M Sivasankar on July 24, asking him to appear before NIA at Kochi office today for interrogation. He is being interrogated in Kerala gold smuggling case. According to the investigation, Sivasankar shared close proximity with the key accused in the gold smuggling cases, Swapna Suresh and Sarith PS. The National Investigation Agency (NIA) on July 24 had submitted before a special NIA court that around Rs 1 crore cash and 982.5 grams gold ornaments were seized from two bank lockers of accused Swapna Suresh, a former consultant with the state's IT department. The matter, which pertains to the smuggling of gold in the state through diplomatic channels, had come to light after 30 kg of gold worth Rs 14.82 crores, smuggled in a consignment camouflaged as diplomatic baggage, was busted by customs in Thiruvananthapuram last month.