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North Korea has enough weapons-grade plutonium to produce 10 nuclear bombs, Seoul's Defense Ministry said. The claim comes after Kim Jong-Un said the country was close to testing an intercontinental ballistic missile.
Pyongyang is currently in possession of 50 kilograms (110 pounds) of weapons-grade plutonium, South Korea's Defense Ministry said on Wednesday.
The amount is enough to make 10 nuclear weapons, and is up from 40 kilograms, eight years previous, the ministry said while presenting its two-yearly white paper.
The report claimed that North Korea produced the extra material by reprocessing used fuel rods from its reactor in Yongbyon.
The North has a "considerable" ability to produce weapons from highly-enriched uranium, the paper said. The ministry was unable to estimate weapons-grade uranium stocks, citing difficulties in penetrating the North's secretive uranium program.
The Institute for Science and International Security in the United States estimated that as of June 2016, North Korea had an arsenal of 13 to 21 atomic weapons, compared to 10 to 16 in 2014.
Last week, leader Kim Jong Un threatened to test-launch a nuclear capable intercontinental ballistic missile. The isolated communist state has carried out five nuclear tests and several missile launches so far.
Pyongyang is thought to be planning a nuclear push in 2017 to develop a weapons system that would be capable of hitting the US mainland. Following Kim's announcement, US President-elect Donald Trump took to Twitter to say such a strike "won't happen."
Analysts are split on how close North Korea is to achieving its nuclear goals, but all agree that it has made large strides since Kim took over as leader after his father Kim Jong Il died in December 2011.
The North's Yongbyon plant was deactivated in 2007 under an aid-for-disarmament agreement, but renovated after the North's third nuclear test in 2013. The type of plutonium needed for a nuclear bomb is typically extracted from spent nuclear reactor fuel.
rs/ksb (AFP, dpa)