The symptoms of the mysterious ailment, first reported by U.S. embassy officials in the Cuban capital Havana in 2016, have included migraines, nausea, memory lapses and dizziness.
About 1,500 cases now have been reported by U.S. government agencies and departments, including some from this year.
Seven of the 18 U.S intelligence agencies conducted the more than two-year investigation in more than 90 countries, including the United States, where the FBI opened a criminal probe.
The agencies even considered the possibility that extraterrestrials were responsible, but ruled that out, a U.S. intelligence official told reporters in a briefing.
“Most IC (intelligence community) agencies have concluded that it is ‘very unlikely” a foreign adversary is responsible,” the assessment said.
It also found “no credible evidence” that any American foe possessed “a weapon or collection device,” including an emitter of electromagnetic energy pulses,…
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