National Investigation Agency (NIA) officials raided a gold ornaments manufacturing unit in Coimbatore on Wednesday in connection with the Kerala gold smuggling case involving Swapna Suresh. Sources said the NIA officials had seized 38 sovereigns of gold ornaments and Rs 2.75 lakh in cash from the unit -- called Sri Senthur Jewels – and from the house of its owner J Nandagopal. The NIA had already arrested Swapna Suresh for illegally smuggling gold to Kerala from Gulf countries.