The mysterious ailment commonly referred to as “Havana syndrome” is not caused by actions of a foreign adversary, a highly anticipated intelligence community review found.

The new intelligence assessment, a declassified version of which was released on Wednesday, caps a yearslong effort by several intelligence agencies to determine the cause and potential for foreign responsibility of the mysterious and sudden injuries reported since 2016 by a small group of American diplomats and spies overseas.

U.S. diplomats in different locations reported symptoms including dizziness, head pain, vision problems, cognitive troubles, vertigo, and possibly traumatic brain injuries beginning at the U.S. Embassy in Cuba in 2016. One leading theory had been that these were microwave weapon attacks, while the top possible culprits were Russia, China, or Cuba, though they now appear cleared of any responsibility.

HAVANA SYNDROME NOT LIKELY A FOREIGN OPERATION: CIA

"Based on the latest IC-wide effort, which has resulted in an ICA that will be issued today, I can share with you that most IC agencies have now concluded that it is 'very unlikely' a foreign adversary is responsible for the reported [anomalous health incidents]," Director of National Intelligence Avril Haines said in a statement. "IC agencies have varying confidence levels because we still have gaps given the challenges collecting on foreign adversaries — as we do on many issues involving them."

Two unnamed intelligence community agencies have “moderate to high confidence” that a foreign adversary is “very unlikely” to be responsible, while three others are at moderate confidence, according to the report. Two other agencies believe it’s “unlikely” an adversary was responsible for it but said it with “low confidence,” based on collection information gaps.

“IC agencies assess that symptoms reported by US personnel were probably the result of factors that did not involve a foreign adversary, such as preexisting conditions, conventional illnesses, and environmental factors,” the report continued. “IC condense in this explanation is bolstered by the fact that we identified medical, environment, and social factors that plausibly can explain many” of the cases reported by U.S. officials.

"As part of this review, the IC identified critical assumptions surrounding the initial AHIs reported in Cuba from 2016 to 2018, which framed the IC’s understanding of this phenomenon, but were not borne out by subsequent medical and technical analysis," Haines continued. "In light of this and the evidence that points away from a foreign adversary, causal mechanism, or unique syndrome linked to AHIs, IC agencies assess that symptoms reported by US personnel were probably the result of factors that did not involve a foreign adversary, such as preexisting conditions, conventional illnesses, and environmental factors."

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A CIA report from January 2022 concluded the same findings, that no adversary was responsible for the mysterious bouts.

"We will seek to ensure the review was conducted with the highest degree of analytical rigor and that it considered all the available intelligence and perspectives, documenting all substantial differences in analysis," U.S. House Intelligence Committee Chairman Mike Turner (R-OH) and ranking member Jim Himes (D-CT) said in a statement. "The Committee will take a skeptical approach and test the assumptions of the IC, as our oversight requires."