A probe has been launched after officials were reportedly "cooked" at their desks in a series of bizarre microwave-attacks on foreign embassies.
US diplomats in Cuba and China are feared to have been targeted after reports of unexplained illnesses grew in the two embassies.
An investigation into the attacks found that microwave radiation was ‘targeted’ at the buildings as officials were struck down at their desks.
The report by the National Academy of Sciences, ordered by the US State Department, looked at head pressure and dizziness suffered in the Cuban capital Havana from 2016.
In total, 26 personnel also suffered hearing loss.
The so-called "Havana Syndrome" also included symptoms experienced by Canadian officials at the US consulate in China around early 2017, The Sun reported.
These mystery illnesses raised suspicions that invisible rays were being beamed into the embassies which are often home to foreign spies.
"Overall, directed pulsed RF energy, especially in those with the distinct early manifestations, appears to be the most plausible mechanism in explaining these cases," reads the report.
RF stands for radio frequency, and its radiation is a "non-ionizing electromagnetic energy characterised by relatively long wavelength, low frequency, and low photon energy".
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Microwave radiation is considered a subset of RG radiation, CBS reported.
David Relman, a professor of medicine at Stanford University and the chairman of the study, called the findings "concerning".
He said: "The committee found these cases quite concerning, in part because of the plausible role of directed, pulsed radiofrequency energy as a mechanism but also because of the significant suffering and debility that has occurred."
The investigation found that employees suffered dizziness, nausea and anxiety due to the attacks.
Officials said: "The committee found the unusual presentation of acute, directional or location-specific early phase signs, symptoms and observations reported by DOS employees to be consistent with the effects of directed, pulsed radiofrequency (RF) energy.
"Many of the chronic, nonspecific symptoms are also consistent with known RF effects, such as dizziness, headache, fatigue, nausea, anxiety, cognitive deficits, and memory loss."
The US Embassy in Cuba is all but closed as a result of the illnesses, according to reports.
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