North Korean Security Believes Ryongchon Explosion an Assassination Attempt According to a source, North Korea's State Safety & Security Agency concluded that the massive explosion that occurred in the North Korean city of Ryongchon on April 22 had been conspired by anti-North Korean government forces to harm North Korean leader Kim Jong-il. A North Korean official who was recently on his business trip to China said, “The North Korean National Security Agency has investigated the incident since it took place and concluded that rebellious forces had plotted the explosions targeting the exclusive train of Kim Jong-il. The security agency, in...