United States President Joe Biden has ordered an investigation of the origin of the Covid-19 pandemic within ninety days.
President Biden also wants the investigation by intelligence officials to find if the virus came from a laboratory in China.
The US intelligence community is divided on whether Covid-19 came from a lab accident or human contact with an infected animal.
The Chinese authorities have also rejected claims that the virus came from a laboratory in the city of Wuhan in late 2019.