By bringing in the foreign media, mainly television networks, the North is apparently hoping to have images of the closing — including explosions to collapse tunnel entrances — broadcast around the world. The group included an Associated Press Television crew.

The North did not invite international inspectors to the ceremony, which limits its value as a serious concession.

The outburst at Pence, issued in the name of a top Foreign Ministry official, comes on the heels of another sharp rebuke of Trump's newly appointed national security adviser, John Bolton, and has raised concerns that a major gap has opened between the two sides just weeks before the June 12 summit in Singapore.

In both cases, Pyongyang was trying to push back against hard-line comments suggesting North Korea may end up like Libya if it doesn't move forward quickly and irreversibly with concrete measures to get rid of its nuclear weapons.

Choe Son-hui, a vice minister of foreign affairs, was quoted Thursday by the North's state-run news agency slamming as "ignorant" and "stupid" comments Pence made in an interview with Fox News that compared the nuclear-capable North to Libya. Libya gave up its program at an early stage only to see its longtime dictator overthrown and brutally killed years later.

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The summit plan has hit a number of speed bumps recently as both sides have begun trading barbs and taking tougher positions. Trump met with South Korean President Moon Jae-in on Tuesday at the White House for consultations and suggested the summit could be delayed or even called off entirely.

Even so, both sides still seem to want to hold the meeting, which would be unprecedented.

Success in talks would be a huge accomplishment for Trump. Meeting with the US president as an equal on the world stage would be a major coup for Kim.

AP