FILE - In this March 20, 1995, file photo, subway passengers affected by sarin gas planted in central Tokyo subways are carried into St. Luke's International Hospital in Tokyo. The doomsday cult that carried out the deadly nerve gas attack on Tokyo's subways in 1995 also used the VX nerve agent suspected in the killing of North Korean leader Kim Jong Un's half brother. One of the people attacked with VX by the cult, Hiroyuki Nagaoka, told Japanese public broadcaster NHK on Friday that news of Kim Jong Nam‚Äôs murder reminded him of his own experience. (AP Photo/Chikumo Chiaki, File)