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US President Joe Biden has ordered intelligence agencies to investigate the emergence of Covid-19, amid growing controversy about the virus’s origins.

In a statement, Mr Biden asked US intelligence groups to “redouble their efforts” and report to him within 90 days.

Covid-19 was first detected in the Chinese city of Wuhan in late 2019.

More than 168 million cases have since been confirmed worldwide and at least 3.5 million deaths reported.

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Authorities linked early Covid cases to a seafood market in Wuhan, and scientists believed the virus