Satellite images revealed that construction work has recently occurred at North Korea’s nuclear testing site, California-based analysts said Tuesday, raising concerns that Pyongyang is planning to resume nuclear explosive testing despite declaring the site’s closure in 2018. Analysts from the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies said in a report that the images were captured on March 4 by the commercial satellite firm Maxar. The report’s lead author Prof. Jeffrey Lewis, stated that his team has been monitoring the Punggye-ri nuclear test site since the North Korean regime announced in January that it would consider resuming all temporarily suspended actions. “In the image, we see very early signs of activity at the new site, including the construction of a new building, repair of another building, and what is possibly some lumber and sawdust,” Lewis said. “North Korea uses a substantial amount of wood at …