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 and South Korea, 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, KCNA 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.

Experts have said the pledge to dismantle the test site is a big step forward but verifying it will be difficult.

Reuters