North Korea on Thursday said that it had   completely dismantled its Punggye-ri nuclear test ground “to ensure the transparency of discontinuance of nuclear test,” state news agency KCNA told Reuters  on Thursday.

The dismantling of the nuclear test ground “completely closed the tunnel entrances,” it said, adding that two tunnels there had been ready for use in “powerful underground nuclear tests”. Reuters reported

There was no leakage of radioactive material or adverse impact on the surrounding environment from the dismantling, the agency added.
“The discontinuance of the nuclear test is an important process moving towards global nuclear disarmament,” KCNA  was quoted as saying to Reuters.