The US Department of Energy has assessed that the Covid-19 pandemic most likely came from a laboratory leak in China, according to a newly updated classified intelligence report.

Two sources said that the Department of Energy assessed in the intelligence report that it had “low confidence” the Covid-19 virus accidentally escaped from a lab in Wuhan.

Intelligence agencies can make assessments with either low, medium or high confidence. A low confidence assessment generally means that the information obtained is not reliable enough or is too fragmented to make a more definitive analytic judgment or that there is not enough information available to draw a more robust conclusion.

The latest assessment further adds to the divide in the US government over whether the Covid-19 pandemic began in China in 2019 as the result of a lab leak or whether it emerged naturally. The various intelligence agencies have been split on the matter for years. In 2021, the intelligence community declassified a report that showed four agencies in the intelligence community had assessed with low confidence that the virus likely jumped from animals to humans naturally in the wild, while one assessed with moderate confidence that the pandemic was the result of a laboratory accident.

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Three other intelligence community elements were unable to coalesce around either explanation without additional information, the report said.

The Wall Street Journal first reported on the new assessment from the Department of Energy. A senior US intelligence official told the Journal that the update to the intelligence assessment was conducted in light of new intelligence, further study of academic literature and in consultation with experts outside government.