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A report by U.S. spy agencies on the origins of COVID-19 delivered to the White House Tuesday didn't yield a definitive conclusion on whether the new coronavirus is a lab accident or natural emergence, U.S. media reported, citing two senior officials.

U.S. President Joe Biden in May told U.S. intelligence agencies to investigate the origins of the COVID-19 pandemic, including the possibility that it emerged from a lab accident, and report back to him in 90 days.

After months of work, that review ended Tuesday.