US intelligence agencies have said they may never be able to identify the origins of Covid-19, as they released a new, more detailed version of their review of whether the coronavirus came from an animal-to-human transmission or leaked from a lab.

The Office of the US Director of National Intelligence said in a declassified report that a natural origin and a lab leak are both plausible hypotheses for how Sars-Cov-2 first infected humans. But it said analysts disagree on which is more likely or whether any definitive assessment can be made at all.

The report also dismissed suggestions that the coronavirus originated as a bioweapon, saying proponents of this theory "do not have direct access to the Wuhan Institute of Virology" and have been accused of spreading disinformation.

Read the full Reuters story here.