Havana syndrome, with symptoms such as dizziness, nausea, migraines and memory lapses, is so named because it first was reported by US officials based in the US embassy in Cuba in 2016.
Burns noted that a US National Academy of Sciences panel in December found that a plausible theory was that “directed energy” beams caused the syndrome.
There was a “very strong possibility” that the syndrome was intentionally caused, and that Russia could be responsible, he said, adding that he was withholding definitive conclusions pending further investigation.
Moscow denies involvement.
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