North Korea may be attempting to restart its main nuclear bomb fuel reactor after a five-month shutdown, experts believe.
Newly released satellite images suggest the country could be in the early stages of bringing its Yongbyon reactor complex back into use.
When fully operational, the five-megawatt facility is capable of producing about six kilos of plutonium a year - enough for a nuclear bomb.
North Korea has conducted three nuclear tests, and recently threatened a fourth, amid tensions over fresh US sanctions and UN moves to censure Pyongyang for its human rights record.
The US-Korea Institute at Johns Hopkins University said the latest satellite images showed fresh activity at Yongbyon prompting suggestions of 'the early stages of an effort to restart the reactor'.
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