Panama finds rocket-propelled grenades on North Korean ship A Panamanian soldier sands guard near a container of the North Korean Chong Chon Gang vessel, where an alleged ageing Soviet-built Cuban radar control system for surface-to-air missiles was found. AUTHORITIES in Panama say they have found more explosives aboard a North Korean-flagged ship detained in the Panama Canal for carrying undeclared arms from Cuba. Anti-drug prosecutor Javier Caraballo said inspectors found a kind of "anti-tank RPG (rocket-propelled grenade) " explosive when they opened one of five wooden boxes on the Chong Chon Gang. He said the other boxes were not opened because of security fears. The discovery comes just over a week after authorities said explosive-sniffing dogs had found another batch of ammunition for grenade launchers and other unidentified types of munitions. The ship was seized on July 15 based on intelligence that it may have been carrying drugs. The manifest said it was carrying 10,000 tonnes of sugar, but Cuban military equipment was found beneath the sacks.