HAVANA — Secretary of State Rex Tillerson said Friday that U.S. diplomats in Havana had been the victims of “health attacks” that left them with hearing loss – the most definitive U.S. statement yet on a series of mysterious incidents that have puzzled longtime observers of U.S.-Cuban relations.

His comments came two days after the State Department issued a vaguely worded statement saying there had been “incidents which have caused a variety of physical symptoms.” U.S. officials later revealed that American diplomats had suffered unexplained losses of hearing, and on Thursday Canada’s government said at least one Canadian diplomat in Cuba also had been treated for hearing loss.

“We hold the Cuban authorities responsible for finding out who is carrying out these health attacks on not just our diplomats but, as you’ve seen now, there are other cases with other diplomats involved,” Tillerson said in Bedminster, New Jersey, where President Donald Trump and administration members spoke to reporters.

In the fall of 2016, a series of U.S. diplomats began suffering unexplained losses of hearing, according to officials with knowledge of the case. Some of the diplomats’ symptoms were so severe that they were forced to cancel their tours early and return to the United States, the officials said.

The officials told The Associated Press that the hearing loss appeared to have been caused by the deliberate use of some sort of sonic device operating outside the range of audible sound.

Former diplomats and students of U.S.-Cuba relations said they found it inexplicable that Cuba would have tried to harm U.S. and Canadian diplomats, particularly in the fall of 2016 as President Barack Obama was reopening of diplomatic relations with the island.

U.S. officials familiar with the incidents said they began to be reported last October, when most domestic and foreign observers expected Hillary Clinton to win the presidency and continue Obama’s policy of normalization with Cuba.

Attacking Canadian diplomats would be an inexplicable assault on one of Cuba’s most important trading partners and its largest source of tourists.

“There’d be no logic to the Cubans trying to deliberately harm U.S. or Canadian diplomats,” said William LeoGrande, an American University expert on Cuban foreign policy. “It’d really be unprecedented.”

The Cuban government said in a lengthy statement Wednesday that “Cuba has never permitted, nor will permit, that Cuban territory be used for any action against accredited diplomatic officials or their families, with no exception.”

Former U.S. and Canadian diplomats said they had been targets of low-level harassment and intimidation by Cuban agents in earlier decades, incidents that included attacks on diplomats’ pets and intimidating maneuvers like tailgating.

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