US intelligence agencies do not expect to determine the origins of Covid-19

President Joe Biden ordered a review into the origins of Covid-19 (Susan Walsh/AP)

US intelligence agencies say it is unlikely they will ever be able to conclude whether Covid-19 spread by animal-to-human transmission or leaked from a lab.

The paper issued by the Director of National Intelligence elaborates on findings released in August of a 90-day review ordered by President Joe Biden.