US President Joe Biden has ordered intelligence officials to "redouble" efforts to investigate the origins of Covid-19, including the theory that it came from a laboratory in China.
He said the US intelligence community was split on whether it came from a lab accident or emerged from human contact with an infected animal.
Mr Biden asked the groups to report back to him within 90 days.
Also Read: 5 reasons why good sleep matters and you have to deal with it