In a breakthrough in the Kerala gold smuggling case, the National Investigation Agency (NIA) on June 9, said that it has arrested one of the key conspirators and fugitive Muhammad Mansoor P H after his return from the UAE at Calicut Airport, reports Yahoo News. The NIA in a statement said that it arrested Mansoor, a resident of Kerala's Kozhikode district, following his arrival at Calicut International Airport from Dubai.The agency said that investigation into the case revealed that Mansoor, while being in UAE, had conspired with the charge sheeted accused Mohammed Shafi P and others to facilitate smuggling of gold to India, through import cargo addressed to diplomats at the UAE Consulate in Thiruvananthapuram in Kerala.The NIA Special Court at Ernakulam had issued a non-bailable arrest warrant against Mansoor.The agency further said that Mansoor was produced before NIA Special Court at Kochi and sent to five days NIA custody.