A new report by a committee of the US National Academy of Sciences has found that "directed" microwave radiation is the likely cause of illnesses among American diplomats in Cuba and China.
The study commissioned by the US State Department and released Saturday (US time) is the latest attempt to find a cause for the mysterious illnesses that started to emerge in late 2016 among US personnel in Havana.
The study found that "directed, pulsed radio frequency energy appears to be the most plausible" explanation for symptoms that included intense head pressure, dizziness and cognitive difficulties. It found this explanation was more likely than other previously considered causes such as tropical disease or psychological issues. The study did not name a source for the energy and did not say it came as the result of an attack, though it did note that previous research on this type of injury was done in the former Soviet Union.
In its report, the 19-member committee noted that it faced significant challenges in trying to get to the bottom of the medical mystery. Among them, not everyone reported the same symptoms and the National Academy of Sciences research did not have access to all the previous studies on the illnesses, some of which are classified.