China hits back as US revisits Wuhan lab leak theory

China has denounced US efforts to further investigate whether Covid-19 came from a Chinese lab.

US President Joe Biden has called on intelligence officials to "redouble" their work to find out how the virus was first transmitted to humans. 

China's foreign ministry accused the US of "political manipulation and blame shifting".

It has rejected any link between Covid-19 and a virus research lab in the Chinese city of Wuhan.

Covid-19 was first detected in Wuhan in late 2019. Since then, more than 168 million cases have been confirmed worldwide and about 3.5 million deaths reported.

Authorities linked early Covid cases to a seafood market in Wuhan, leading scientists to theorise that the virus had first passed to humans from animals.