S.Korea gravely concerned at North's test threat
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South Korea voiced grave concern on Wednesday over North Korea's plans to test a nuclear device and China urged restraint after the United States said the move would be "an unacceptable threat" to world peace.
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North Korea has accused the United States of threatening war by carrying out a test of its missile defense system and conducting joint military exercises with the South.
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South Korea reacted with shock and  suspicion on Friday to the first declaration from the reclusive  North that it had nuclear weapons and had pulled out  indefinitely from six-party disarmament talks.
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The United States, Japan, and South Korea have increased security measures after detecting signs of a possible North Korean test launch of its Rohdong ballistic missile (range: approximately 1,300km).
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TOKYO, Oct. 4 -- North Korea declared Tuesday that it would conduct a nuclear test to bolster its defenses against the United States, raising tensions in the region and marking the communist government's first unambiguous pledge to prove it has become a nuclear power.
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North Korea threatened on Friday to take   "stronger physical actions" after Japan imposed punitive   measures in response to its barrage of missile tests and pushed   for international sanctions at the United Nations.
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ELEANOR HALL: A huge explosion in North Korea near the border with China has sparked fears around the world about the communist regime&#39;s nuclear capacity.
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The Bush administration said Tuesday that a North Korea nuclear test would be an "unacceptable threat to peace and stability" and further isolate Pyongyang from the rest of the world.
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South Korean and US military authorities are on alert as North Korea appears to be preparing to test-fire a missile, the Defense Ministry said yesterday.
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The United States warned that it would be a major international concern if North Korea launched a long-range missile, amid reports Pyongyang may be preparing to test-fire the weapon.
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South Korea first saw signs of an explosion in North Korea last week from a satellite that showed a &quot;peculiar cloud&quot;, but Seoul doubts Pyongyang would test a nuclear bomb so close to China.
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SEOUL -- North Korea's neighbors scrambled yesterday to forge a common front against Pyongyang's threatened nuclear test, with South Korea warning of a regional atomic arms race that could upend the regional balance of power.
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The UN nuclear watchdog says South Korea's illegal nuclear tests were on a bigger scale than declared.
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North Korea angrily mocked international criticism of its multiple missile tests, threatening on Thursday to fire off more rockets.
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Japan expressed "serious concern" to  North Korea on Saturday about its reported plan to test-fire a  ballistic missile but the Koreans did not respond, the head of  Japan's delegation at talks in Beijing was quoted as saying.
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South Korean Foreign Minister Ban Ki Moon said Thursday that intelligence indicating a possible launch of a North Korean ballistic missile is &quot;very much alarming
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SEOUL, South Korea/Washington  - A huge explosion  rocked North Korea last week but U.S. and South Korean  officials said Sunday it was unlikely to have been a nuclear  weapons test despite the appearance of a "peculiar cloud" over  the area.