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This April 18, 2012 satellite image provided by GeoEye shows North Korea's Punggye-ri nuclear test site. Commercial satellite imagery shows increased activity at North Korea’s nuclear test site but not enough to indicate an underground atomic explosion is imminent, a U.S. research institute said Tuesday. North Korea last month threatened to conduct its fourth nuclear test and there’s been speculation it may do so as President Barack Obama travels to Asia this week. (AP Photo/GeoEye) **FILE**

This April 18, 2012 satellite image provided by GeoEye shows North Korea's Punggye-ri nuclear test site. Commercial satellite imagery shows increased activity at North Korea’s nuclear test site but not enough to indicate an underground atomic explosion is imminent, a U.S. research institute said Tuesday. North Korea last month threatened to conduct its fourth nuclear test and there’s been speculation it may do so as President Barack Obama travels to Asia this week. (AP Photo/GeoEye) **FILE**

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