Scientists have identified 'significant differences' in the brains of the diplomats 'attacked' in Cuba.
A group of Canadian diplomats has filed a lawsuit after succumbing to the mysterious 'sonic attacks' in Cuba.
It has been suggested that the mystery sounds heard by US diplomats may have been nothing more than insects.
According to reports, several US officials have cited Russia as being the main suspect in the investigation.
Scientists now believe that microwave weapons were used in the recent attacks on US diplomats in Havana.
To date, more than two dozen embassy personnel have been affected and nobody has been able to explain why.
A US government employee working in the city of Guangzhou has reportedly experienced similar symptoms.
Scientists may have found an alternative explanation for the strange sounds heard by diplomats in Havana.
Doctors have found brain abnormalities in some of the victims of the mysterious acoustic attacks in Cuba.
A clip of the high-pitched sound that US diplomats have been hearing in Cuba has been uploaded online.
The US has ordered 15 Cuban embassy officials to leave the country over a failure to protect US diplomats.
Authorities in the US are urging people not to visit Cuba after a string of 'sonic' attacks on diplomats.
US diplomats stationed in Cuba have recently been subjected to a series of mysterious 'health attacks'.
The Pentagon and the US Air Force are working on developing hypersonic weapons and aircraft.