Tillerson's comments were the strongest indication to date that the United States might mount a major diplomatic response, potentially jeopardizing the historic restart of relations between the US and Cuba. The two former foes reopened embassies in Washington and Havana in 2015 after roughly a half-century of estrangement.
"We have it under evaluation," Tillerson said of a possible embassy closure. "It's a very serious issue with respect to the harm that certain individuals have suffered. We've brought some of those people home. It's under review."
Some victims felt vibrations or heard loud sounds mysteriously audible in only parts of rooms, leading investigators to consider a potential "sonic attack." Others heard nothing but later developed symptoms.
Tillerson once called the events "health attacks," but the State Department has since used the term "incidents" while emphasizing the US still doesn't know what has occurred. Cuba has denied any involvement or responsibility but stressed it's eager to help the US resolve the matter.
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The last reported incident was on August 21, according to a US official briefed on the matter. The official wasn't authorized to discuss the matter publicly and requested anonymity.
Tillerson spoke on CBS' "Face the Nation" as world leaders and top diplomats descended on New York for annual UN General Assembly meetings. President Donald Trump will give his first speech on the major global platform this week.
Cuba is also represented at the UN, but it's not expected Trump will meet with any Cuban leaders or officials during his visit.
In Washington, lawmakers in Congress have been raising alarm over the incidents, with some calling for the embassy to be closed. On Friday, five Republican senators wrote Tillerson urging him to not only shutter the embassy, but also kick all Cuban diplomats out of the United States, a move with dramatic diplomatic implications
The incidents have frightened Havana's tight-knit diplomatic community, raising concerns about the potential scope. At least one other country, France, has tested embassy staff for potential sonic-induced injuries, the AP has reported.
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