Sixteen U.S. officials were harmed in Cuba in a mysterious incident targeting U.S. diplomats sent to Havana, the State Department confirmed Thursday.

“We can confirm that at least 16 U.S. government employees, members of our embassy community, have experienced some kind of symptoms,” State Department spokeswoman Heather Nauert told reporters at a press briefing. “They have been provided medical treatment in the United States, as well as in Cuba.”

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