The United States says at least 16 American diplomats working for the U.S. government in Cuba suffered severe hearing loss as a result of activity attributed to a covert sonic device.
This is the first time the U.S. has disclosed a number of Americans were affected. State Department spokeswoman Heather Nauert said it's possible there are more. But she said all of the 16 are U.S. citizens.
They've been treated by doctors either in Cuba or the U.S.
Nauert said the incidents are no longer occurring. But she said the U.S. hasn't located a device that caused the symptoms and hasn't identified the perpetrator.
Some of the 16 are still in Cuba and others have returned to the U.S. Nauert said Cuba is cooperating with the U.S. investigation.