attack on the brainwaves this is seriously crazy shit!
(CNN)The US believes several State Department employees at the US embassy in Havana were subjected to an "acoustic attack" using sonic devices that left at least two with such serious health problems they needed to be brought back to the US for treatment, several senior State Department officials told CNN.
One official said the employees could have suffered permanent hearing loss as a result.
The employees affected were not at the same place at the same time, but suffered a variety of physical symptoms since late 2016 which resembled concussions.
The State Department raised the incidents with the Cuban government over the course of several months and sent medical personnel to Havana, but have not been able to determine exactly what happened.
"It can be quite serious," one official told CNN. "We have worked with the Cubans to try and find out what is going on. They insist they don't know, but it has been very worrying and troublesome."
The FBI is now looking into the matter, the officials said.
"It's very strange," one official said.
State Department spokeswoman Heather Nauert on Wednesday said that "some US government personnel" working at the US embassy in Havana, Cuba on official duty reported some incidents that were causing "physical symptoms." But she could not elaborate on the nature or cause of the incidents.
"Because there are a variety of symptoms, there could be a variety of sources," one US official said. "That is why we are being very careful here with what we say. There is a lot we still don't know."
US embassy employees in Cuba possibly subject to 'acoustic attack' - CNNPolitics