Kim Jong-un's major nuclear site.Satellite imagery shows a coal-fired steam plant is in operation at North Korea's Yongbyon Nuclear Science and Weapons Research Center, about 100k north of the country's capital Pyongyang.Experts fear this could mean the country is ramping up its nuclear programme.Analysis website 38 North, who uncovered the images, said: "Smoke was observed emerging from the plant's smokestack at various times from late February and early March, suggesting that preparations for spent fuel reprocessing could be underway to extract plutonium needed for North Korea's nuclear weapons."However, this could also mean simply the facility is being prepped to handle radioactive waste."This activity at the steam plant was the first.
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