Despite medical study, mystery over sickness of US diplomats in Cuba remains unsolved

The spat dates back to 2016 when at least two dozen people who worked at the US Embassy in Havana began suffering from a mix of dizziness, headaches, hearing loss, sleep problems and cognitive issues.

Those afflicted said the symptoms started after they heard mysterious, loud sounds in their homes or hotel rooms that were sometimes accompanied by the sensation of movement in the air. The noises appeared to be directed at the victims and were no longer audible if the person switched rooms or even moved a few feet. Sometimes the sounds were undetectable by other people in the same room.

American tourists and staff at the Canadian Embassy in Havana reported similar incidents.