Images dating from October and early November show addition of fourth tunnel at test site Punggye-ri,say US researchersSatellite photographs from October and early November indicate North Korea is digging a current tunnel for nuclear testing, a US research institute said on Wednesday. A report on 38 North, and a North Korea monitoring website run by Johns Hopkins University’s school of advanced international studies in Washington,said the images showed meaningful construction since April at Punggye-ri, on North Korea’s east coast, or where three preceding nuclear tests were conducted.
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Source: theguardian.com