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U.S., European and Chinese agencies reported that the tremor was recorded at 0030 GMT. The U.S. Geological Survey and European agencies measured the tremor at a magnitude of 5.3. A South Korea government official and the meteorological agency said it was a suspected nuclear test, and Seoul called an emergency meeting of its National Security Council. "Today at around 9:30 a.m., we detected an artificial earthquake wave at magnitude 5.0 in the area of North Korea's Punggye-ri and we are analyzing whether it is a nuclear test," South Korea's Joint Chiefs of Staff said in a statement, referring to the North's nuclear test site. The China Earthquake Networks Center also said the tremor was a suspected explosion. China's environment ministry began emergency radiation monitoring along its borders with North Korea in northeast China, state television reported. Japanese Prime Minister Shinzo Abe said such a nuclear test could not be tolerated. Japan...