TOKYO - Japan has concluded that the tremors detected in North Korea were a nuclear explosion, marking the sixth atomic test by Pyongyang since 2006.
"After examining the data we concluded that it was a nuclear tests," Foreign Minister Taro Kono said at a briefing broadcast by public broadcaster NHK following a meeting of Japan's National Security Council.
Japan's Ministry of Defense said it had dispatched at least three military jets from bases in Japan to test for radiation.
