The Democratic People's Republic of Korea (DPRK) on Thursday blew up the tunnels of the Punggye-ri nuclear test site located in the northeast of the country, and officially announced its dismantlement.

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

Satellite photo shows Punggye-ri nuclear test site in August 2016. [File Photo: IC]

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

Following the explosion, the DPRK will remove all observation facilities and research institutes, withdraw guards and completely close the surrounding testing area.

The DPRK conducted six nuclear tests at Punggye-ri between October 2006 and September 2017.

The Third Plenary Meeting of the Seventh Central Committee of the ruling Workers' Party of Korea made the decision last month that the country will discontinue its nuclear tests and intercontinental ballistic rocket test-fire from April 21, according to an earlier report from the official Korean Central News Agency.