JAPAN NORTH KOREA NUCLEAR TESTS 2006-10-19 00:00:00 epa00843692 (FILES) A files handout photograph of the Hiroshima A-bomb blast photographed by the U.S. military on 6 August 1945.The A-bomb blast that killed over 140,000 people in Hiroshima was the first of only two nuclear bombs ever to be used. With tensions growing in east Asia over North Korea's nuclear tests and intentions to test more nuclear weapons the U.S is concerned a nuclear arms race could begin in earnerst across east Asia. Japan is the only nation on earth ever to experience the devestating effects of a nuclear explosion. EPA/A PEACE MEMORIAL MUSEUMHANDOUT | Foto: ISIFA