PYONGYANG, May 24 -- The Democratic People's Republic of Korea (DPRK) has confirmed the demolition of its nuclear test site at Punggye-ri on Thursday, saying that all the tunnels have been collapsed by explosions and their entrances completely closed, according to the Korean Central News Agency (KCNA).

The Nuclear Weapons Institute of the DPRK issued a statement saying that a ceremony was held "for completely dismantling the northern nuclear test ground ... to ensure transparency of the discontinuance of nuclear tests."

"Dismantling the nuclear test ground was done in such a way as to make all the tunnels of the test ground collapse by explosion and completely close the tunnel entrances, and at the same time, explode some guard facilities and observation posts on the site," the statement said.

The statement also said that it has been confirmed that there was neither leakage of radio-active materials nor any adverse impact on the surrounding ecological environment.

Complete closure of the area surrounding the nuclear test ground will come after a successive removal of all ground observation facilities, research institutes and structures of guard units, and withdrawal of staff concerned, it said.

The three tunnels of the test site were blown up by 16:00 local time (0700 GMT), according to Xinhua reporters on site.

Pyongyang invited journalists from China, Russia, the United States, South Korea and Britain to witness the site's dismantlement.

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