“We don’t think we’re one or two reports away from being able to understand it,” said one official, who spoke on condition of anonymity to discuss intelligence matters.

Barring an unforeseen breakthrough, intelligence agencies won’t be able to conclude whether COVID-19 spread by animal-to-human transmission or leaked from a lab, officials said Friday in releasing a fuller version of their review into the origins of the pandemic, AP reports.

The paper issued by Director of National Intelligence Avril Haines elaborates on findings released in August of a 90-day review ordered by President Joe Biden. That review said that U.S. intelligence agencies were divided on the origins of the virus but that analysts do not believe the virus was developed as a bioweapon and that most agencies believe the virus was not genetically engineered.

China has resisted global pressure to cooperate fully with investigations into the pandemic or provide access to genetic sequences of coronaviruses kept at the Wuhan Institute of Virology, which remains a subject of speculation for its research and reported safety problems. Biden launched the review amid growing momentum for the theory — initially broadly dismissed by experts — that the virus leaked from the Wuhan lab. Former President Donald Trump and his supporters long argued that a lab leak was possible as they sought to deflect criticism of his handling of the pandemic.

China remains an exceedingly difficult place for intelligence operations and has fought back against allegations that it mishandled the emergence of the pandemic, which has killed 5 million people worldwide. Senior officials involved in the full report’s drafting said they hoped it would better inform the public about the challenges of determining the virus’s origins.

“We don’t think we’re one or two reports away from being able to understand it,” said one official, who spoke on condition of anonymity to discuss intelligence matters.

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