The head of the World Health Organization said that a long-awaited report into the origins of the new coronavirus following a mission to China where the virus first emerged will be released publicly on Tuesday but that further study is required.

Asked to comment further on its conclusions, Tedros Adhanom Ghebreyesus said: "As I have said all hypotheses are on the table and warrant complete and further studies."

German international development minister Gerd Mueller said at the same briefing that he welcomed China's cooperation with the probe, which took place in January-February.