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The UN's nuclear watchdog says it has detected signs North Korea may be operating its nuclear reactor used for making plutonium for atomic bombs.
In an annual report posted on its website, the International Atomic Energy Agency says it has seen releases of steam and water from a reactor at the Yongbyon nuclear complex.
IAEA inspectors have not been allowed on North Korean soil since 2009 but the agency said North Korea's nuclear program "remains a matter of serious concern" and that it continued to monitor developments at Yongbyon through satellite imagery.
North Korea announced last year it would restart its five-megawatt research reactor at the complex, saying it was seeking a deterrent capacity.