Covid-19 origin

WHO team investigating virus origins denied entry to China

Two members had already set out on their journey - one has now turned back and the other is in transit in a third country.

The WHO said the problem was a lack of visa clearances.

The long-awaited probe was agreed upon by Beijing in December after many months of negotiations with the WHO.

The virus was first detected in Wuhan in late 2019, with the initial outbreak linked to a market.