China has dispatched a team to North Korea including medical experts to advise on North Korean leader Kim Jong Un, according to three people familiar with the situation.

The trip by the Chinese doctors and officials comes amid conflicting reports about the health of the North Korean leader. Reuters was unable to immediately determine what the trip by the Chinese team signaled in terms of Kim's health.

A delegation led by a senior member of the Chinese Communist Party's International Liaison Department left Beijing for North Korea on Thursday, two of the people said. The department is the main Chinese body dealing with neighbouring North Korea.

The sources declined to be identified given the sensitivity of the matter.

The Liaison Department could not be reached by Reuters for comment late on Friday. China's foreign ministry did not immediately respond to a request for comment late on Friday.

Daily NK, a Seoul-based website, reported earlier this week that Kim was recovering after undergoing a cardiovascular procedure on April 12. It cited one unnamed source in North Korea.

South Korean government officials and a Chinese official with the Liaison Department challenged subsequent reports suggesting that Kim was in grave danger after surgery. South Korean officials said they had detected no signs of unusual activity in North Korea.

On Thursday, U.S. President Donald Trump also downplayed earlier reports that Kim was gravely ill. "I think the report was incorrect," Trump told reporters, but he declined to say if he had been in touch with North Korean officials.

On Friday, a South Korean source told Reuters their intelligence was that Kim was alive and would likely make an appearance soon. The person said he did not have any comment on Kim's current condition or any Chinese involvement.

An official familiar with U.S. intelligence said that Kim was known to have health problems but they had no reason to conclude he was seriously ill or unable eventually to reappear in public.

A U.S. State department spokeswoman had no comment. U.S. Secretary of State, Mike Pompeo, when asked about Kim's health on Fox News after Trump spoke said, "I don't have anything I can share with you tonight, but the American people should know we're watching the situation very keenly."