Pompeo holds second day of N.Korea talks

US Secretary of State Mike Pompeo says progress has been made in talks with North Korea

US Secretary of State Mike Pompeo has begun a second day of talks in North Korea attempting to agree details on how to dismantle the country's nuclear program, and both sides say they have things to "clarify" from the previous day.

After spending his first night in the North Korean capital in three visits this year, Pompeo left the government guesthouse on Saturday to make a secure phone call to President Donald Trump to provide an update on the talks.

Pompeo then sat down again with Kim Yong Chol, a top North Korean party official and former spy agency chief who played a key role with Pompeo in arranging the June 12 summit between Trump and North Korean leader Kim Jong-un in Singapore.

Kim Yong Chol said the two had had "very serious discussion on very important matters yesterday" and joked that as a result, Pompeo "might have not slept well last night" at the prestigious Paekhwawon, or 100 Flowers Garden, guesthouse.

Pompeo replied: "Director Kim, I slept just fine. We did have a good set of conversations yesterday. I appreciate that and I look forward to our continued conversations today as well."

Pompeo reiterated that Trump was "committed to a brighter future for North Korea".

"So the work that we do, the path toward complete denuclearisation, building a relationship between our two countries, is vital for a brighter North Korea and the success that our two presidents demand of us," Pompeo said.

Kim agreed that the work was important. "There are things that I have to clarify," he said.

"There are things that I have to clarify as well," Pompeo said.

US State Department spokeswoman Heather Nauert told reporters that US and North Korean officials had set up working groups to deal with "nitty-gritty stuff", including verification of efforts to achieve denuclearisation, which would be headed on the US side by Sung Kim, a Korean-American who is also ambassador to the Philippines.

Nauert said Pompeo's discussions with North Korean officials also included repatriation of American Korean War remains.