North Korea may have produced an additinal six or more nuclear weapons over the past 18 months, possibly bringing its total arsenal to more than 21 bombs, a US think tank said Tuesday.
The Institute for Science and International Security (ISIS) based the estimates on the amounts of weapons-grade plutonium and highly enriched uranium the North is believed to have produced at its Yongbyon nuclear complex.
The report came after International Atomic Energy Agency (IAEA) chief Yukiya Amano said last week that North Korea might have reactivated a plant at Yongbyon for reprocessing plutonium for use in nuclear weapons.
In late 2014, ISIS estimated the North's nuclear arsenal at 10 to 16 weapons.
Since then, the North has added another four to six weapons to the stockpile for a total of 13 to 21 or more today, ISIS said.
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