North Korea making preparations for possible nuclear test: defense officials

North Korea may be preparing for nuclear tests, as U.S. spy satellites have detected new tunnels being dug in the country, at a location where such tests have been conducted in the past, two U.S. defense officials told Fox News.

According to the defense officials, intelligence analysts discovered excavation equipment active in Kilju, located in the Hamgyong province, at a site where a nuclear weapons test had most recently been conducted in September 2017.