Trump's Secretary of State Mike Pompeo said on Friday North Korea can look forward to "a future brimming with peace and prosperity" if it agrees to quickly give up its nuclear weapons.

Officials in Seoul had said in April that North Korea planned to invite experts and journalists from the United States and South Korea for the shutdown of its test site.

North Korea said journalists from other countries, including the United States, South Korea, China, Russia and Britain, will be invited to cover the event, to "show in a transparent manner the dismantlement of the northern nuclear test ground to be carried out".

In order to accommodate the travelling journalists, North Korea said various measures would be taken including "opening territorial air space".

All international journalists will be provided with a charter flight into Wonsan, a port city in eastern North Korea, from Beijing, the news agency said. There, reporters will board a charter train to the nuclear test ground in an "uninhabited deep mountain area".

North Korea's six known nuclear tests have taken place in Punggye-ri, a location in the northeastern part of North Korea where a system of tunnels have been dug under Mount Mantap.

Some experts have said the pledge to dismantle the test site is a big step forward, but verifying it will be difficult. Others say the closure of the site is mostly symbolic and doesn't represent a material step toward denuclearisation.

Still, the closure of the site could be a useful precedent for Washington and Seoul as they proceed with the nuclear negotiations with Pyongyang, analysts say.

"Now that North Korea has accepted in principle that agreements should be verified, US negotiators should hold them to this standard for any subsequent agreement," said Adam Mount, a senior defense analyst at the Federation of American Scientists. "It will make it more difficult for Kim Jong-un to deny inspections now that he has placed them on the table."

North Korea has invited the outside world to witness the dismantling of its nuclear facilities before. In June 2008, international broadcasters were allowed to air the demolishing of a cooling tower at the Nyongbyon reactor site, a year after the North reached an agreement with the US and four other nations to disable its nuclear facilities in return for an aid package worth about $400 million.