Satellite imagery shows increasing activity at North Korea's Punggye-ri nuclear test site, according to a report by research institute Open Nuclear Network - signaling that Pyongyang is preparing to detonate its first nuclear weapon in five years.
The report, released Monday by the Vienna-based institute, identifies new developments at the site since last December, including signs of excavation of one of the site's four former test tunnels, construction activities and increased traffic nearby.
"These developments clearly indicate that the [North Korea] has reactivated, or is in the process of reactivating, some parts of its nuclear weapon test site," ONN Senior Analyst Katsuhisa Furukawa, a former member of the UN Panel of Experts on North Korea, wrote in the report.
