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Washington says 24 U.S. government officials and spouses fell ill in Havana in their homes and some hotels starting in 2016.

Secretary of State Rex Tillerson has said he’s “convinced these were targeted attacks,” but the U.S. doesn’t know who’s behind them. The U.S. has withdrawn most of its diplomats from Havana, citing a health risk, and forced many Cuban diplomats to leave Washington.

Cuba has decried the reductions as an unjustified blow to U.S.-Cuban relations that were restored under President Barack Obama.

“The Cuban Interior Ministry is saying the FBI has told them there is no evidence of a sonic attack, even though that term is being used, attack, there is no evidence of it,” Flake told the AP. “There’s no evidence that somebody purposefully tried to harm somebody. Nobody is saying that these people didn’t experience some event, but there’s no evidence that that was a deliberate attack by somebody, either the Cubans or anybody else.

“As I said, I won’t talk about what I have seen in a classified setting, but nothing is inconsistent with what the Cubans have said, and I think the FBI would say that.”

Flake, one of President Donald Trump’s toughest Republican critics, announced last year that he would not seek re-election as Senator from Arizona. He has not ruled out running against Trump in 2020.

Several of the 24 U.S. diplomats and spouses reported hearing loud, mysterious sounds followed by hearing loss and ear-ringing, leading some U.S. officials to describe the incidents as “sonic attacks.” But officials are now carefully avoiding that term.

Medical testing has revealed that some embassy workers had apparent abnormalities in their white matter tracts that let different parts of the brain communicate, several U.S. officials said, and acoustic waves have never been shown to alter those tracts.

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Michael Weissenstein on Twitter: https://twitter.com/mweissenstein