US detainees leaving North Korea: Trump

US President Donald Trump says three Americans detained by North Korea are on their way home with Secretary of State Mike Pompeo.

"I am pleased to inform you that Secretary of State Mike Pompeo is in the air and on his way back from North Korea with the 3 wonderful gentlemen that everyone is looking so forward to meeting. They seem to be in good health," Trump wrote in a post on Twitter.

Trump said he would greet Pompeo and the Americans when they land at Andrews Air Force Base outside Washington at 2am EDT (0600 GMT) on Thursday morning. "Very exciting!" he wrote on Twitter.

The fate of Korean-Americans Kim Hak-song, Tony Kim and Kim Dong-chul had been among a number of delicate issues in the run-up to the first-ever meeting of US and North Korean leaders.

Trump sent Pompeo to Pyongyang to accompany the men home following US calls for Kim to free them as a gesture of goodwill and sincerity before the US-North Korea meeting, which is expected to take place in late May or early June.