A number of military facilities are known or believed to be located in Kilju . These include the Hwadae-ri atomic weapons training facility . This was first built with Soviet assistance in 1958 , and rose to international prominence when the 2006 North Korean nuclear test , 2009 North Korean nuclear test , 2013 North Korean nuclear test , and 2017 North Korean nuclear test were reported to have been held at Punggye-ri Nuclear Test Site in the area of Mantapsan mountain , in the northernmost part of the county . The Musudan-ri missile facility is located in nearby Hwadae county , and a separate Scud facility has been reported in the area
2013 North Korean nuclear test
2013 North Korean nuclear test
Kilju County