A Chinese research lab at the centre of a conspiracy theory over the origins of Covid had a "serious biocontainment incident" months before the pandemic started, a new report claims.
The Wuhan Institute of Virology was also understaffed and marred with safety issues, according to a Senate investigation.
The 329-page report consists of two years of work and claims the first death from the virus was in September 2019, two months earlier than first thought.
