President Donald Trump has confirmed that a meeting between CIA director Mike Pompeo and North Korean leader Kim Jong Un has taken place.
The US president tweeted to confirm reports that the CIA chief had flown to Pyongyang for a covert meeting with Mr Kim.
“Meeting went very smoothly and a good relationship was formed," he wrote.
“Details of summit are being worked out now. Denuclearization will be a great thing for World, but also for North Korea!”
US officials have said that the aim of Mr Pompeo's trip was to prepare for a summit between the leaders.
Mr Trump said earlier that five locations were currently under consideration for the meeting, which was scheduled to take place by early June.
White House press secretary Sarah Huckabee Sanders said Mr Trump and Mr Kim had not spoken directly.
The representatives for each country are at the most senior level yet for communications between America and North Korea.
Mr Kim’s offer for a summit was initially conveyed to Mr Trump by South Korea last month, and the president shocked many by accepting it.
US officials recently indicated that North Korea’s government had communicated directly with Washington that it was ready to discuss its nuclear weapons programme.
It would be the first summit between the US and North Korea during more than six decades of hostility since the Korean War.
North Korea’s nuclear weapons and its capability to deliver them by ballistic missile pose a growing threat to the US mainland.