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Experts say satellite imagery of North Korea's north-east Punggye-ri site, where previous nuclear tests were conducted, shows deep tunnelling, and other preparations may be under way for a third nuclear test, possibly based on the country's yet-unproven highly enriched uranium program.
''A nuclear test next month is a virtual certainty,'' said Marcus Noland, a North Korea expert at the Peter G. Peterson Institute for International Economics in Washington.