KATHMANDU, Sept 5: The Department of Revenue Investigation (DRI) has uncovered that the 60 kg gold smuggling network, recently seized, used WeChat and WhatsApp for communication. Ever since the Central Investigation Bureau (CIB) of Nepal Police started its investigation into the smuggling case, it has been found that their network has been expanded through WeChat and WhatsApp, while testing the technical devices used by them, including mobiles phones.