The U.S. Department of Defense has been testing a device believed to emit pulsed radio waves as part of an ongoing investigation into Havana syndrome, a mysterious illness reported by U.S. personnel in multiple countries, CNN reported.
The condition, formally known as anomalous health incidents (AHIs), was first identified in 2016 among U.S. diplomats in Cuba but has since been reported by American diplomats, intelligence officers and military personnel in China, Russia, Europe, Southeast Asia and the United States.
According to CNN, the device under review is linked to one of several unproven theories, including possible exposure to directed energy. Other hypotheses examined by U.S. agencies include neurotoxins and stress-related causes. The Pentagon and the Department of Homeland Security did not immediately respond to requests for comment.
Medical findings remain inconclusive. A 2024 study by the National Institutes of Health, published in JAMA, found no structural brain differences in MRI scans of 81 affected individuals compared with control subjects.
Lead author Carlo Pierpaoli said the findings showed no evidence of severe or progressive brain injury.
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