S Korea in 'rogue' nuclear trials
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The BBC is told that South Korean scientists engaged in secret, illegal experiments to enrich nuclear fuel.
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Description: South Korea reveals it extracted small amounts of plutonium in a 1982 test and performed a uranium-enrichment experiment in 2000.
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SEOUL The South Korean government insisted Friday that what it called an experiment to enrich uranium at the Korea Atomic Energy Institute in 2000 was an unauthorized experiment by unsupervised scientists.
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A huge blast three days ago in North  Korea was unlikely to have been a nuclear weapons test, South  Korea's unification minister said on Sunday.
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A South Korean accused of spying on North Korea for his government during the last two years has been charged with repeatedly lying about his activities in the United States, federal authorities said Thursday.
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North Korea has said it has turned plutonium from 8,000 spent fuel rods into nuclear weapons. Speaking at the UN General Assembly, Vice Foreign Minister Choe Su-hon said the weapons were needed for &quot;self-defence&quot; against &quot;US nuclear threat&quot;.
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The South Korean government is seeking to persuade members of the international nuclear organization on its transparency over the recently revealed plutonium- and uranium-based tests.
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He said Friday that South Korea's recently disclosed work with uranium and plutonium did not appear to be part of a weapons program, describing it as "simply two scientific experiments on a small scale."
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Inspectors from the International Atomic Energy Agency (IAEA) have been investigating South Koreaâs nuclear-related facilities after learning that its government secretly produced small quantities of nuclear material, apparently in violation of its IAEA
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South Korea has admitted conducting experiments on nuclear materials in the past without the knowledge of the International Atomic Energy Agency (IAEA), the UN nuclear watchdog.
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South Korea admitted it had conducted plutonium-based nuclear research in the early 1980s.
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The International Atomic Energy Committee (IAEA) has judged that South Korea&#39;s past experiments with nuclear materials didn&#39;t constitute a failure to execute nuclear safeguards, but the failure to report the experiments was a mistake.
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South Korean government scientists  conducted unsanctioned uranium enrichment tests three times in  2000 but they were repeated procedures of a single experiment,  a spokesman at the state-run atomic research center said on  Sunday.
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South Korea's key allies play down a shock admission its scientists experimented to enrich uranium.
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The UN's nuclear watchdog expresses "serious concern" at South Korea's secret nuclear research.
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Investigators from the UN nuclear watchdog began a week-long investigation into South Korea's past nuclear experiments after Seoul renewed a pledge never to develop atomic weapons.
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Analysis: More tough talk, another provocation. What's behind Pyongyang's threat to test a nuclear weapon?