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The illnesses first affected people at the US embassy in Havana in 2016-17. Those suffering from Havana syndrome, as the condition has become known, have complained of headaches, nausea, dizziness, blurred vision and other ailments.
Recently, a report from National Academies of Sciences, Engineering and Medicine, commissioned by the State Department, suggests the involvement of radio frequency energy.
According to The Guardian, Researchers did not identify the source of the energy – nor a possible culprit – but they said western and Soviet studies going back decades offered “circumstantial support for this possible mechanism”.
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The US accused Cuba of carrying out “sonic attacks”, which it strongly denied, and the incident led to increased tension between the two nations.