A team of investigators working on behalf of the World Health Organization carried out a visit to a major virus research laboratory in China's central city of Wuhan, in its search for clues to the origins of the Covid-19 pandemic.
The team spent about three-and-a-half hours at the heavily-guarded Wuhan Institute of Virology, which has been at the centre of some conspiracy theories that claim a laboratory leak caused the city's first coronavirus outbreak at the end of 2019.
Most scientists reject the hypothesis, but some speculate that a virus captured from the wild could have figured in lab experiments to test the risks of a human spillover and then escaped via an infected staff member. "Very interesting.