North Korean authorities are in the process of extending the Pyongyang metro system, multiple sources have told NK News, claims which also appear to be backed up by commercially accessible satellite imagery.

The two-line metro system – which first opened in 1973 and is said to include secret government-only lines – is being expanded to the west of the existing Kwangbok terminus of the Hyoksin line, sources said.

Underground facilities within at least three new stations had recently been completed, one of the sources said, with one of the locations reported to be to the immediate southwest of Pyongyang’s iconic Schoolchildren’s Palace.