American researchers believe North Korea has restarted a nuclear reactor capable of producing plutonium for weapons.
A US-Korea institute says satellite imagery from late August shows white steam rising from the Yongbyon nuclear facility, suggesting the reactor is either up and running or close to coming online.
The US special envoy for North Korea said if the restart was confirmed it would be very serious and a violation of several UN resolutions.
Pyongyang said in April that it intended to revive the ageing reactor, adding three months later that it would not give up its nuclear deterrent until Washington ended what it called its “hostile policy” towards North Korea.
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