NEW satellite imagery appears to show preparations under way at a North Korean nuclear test site.
Early this month South Korean intelligence reported the digging of a new tunnel at the Punggye-ri site, which it took as a sign that North Korea was covertly preparing for a third nuclear test, following previous ones in 2006 and 2009.
The US-Korea Institute at Johns Hopkins School of Advanced International Studies provided an analysis of a sequence of photos from a private satellite operator taken between March 8 and April 18.
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