Recent satellite images of North Korea's main nuclear complex show suspicious activity that could be linked to re-processing plutonium for additional nuclear bombs, a US think tank said Tuesday.
Analysis of the images focused on exhaust plumes from a steam plant used to heat a radiochemical laboratory facility at the Yongbyon complex.
The facility is used for processing plutonium from a five-megawatt reactor at Yongbyon into weapons-grade fissile material.
Whether the exhaust plumes mean "re-processing additional plutonium is under way or will be in the near future remains unclear", analysts at the US-Korea Institute at Johns Hopkins University concluded.
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