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Advanced brain scans of U.S. Embassy employees who reported falling ill while serving in Havana revealed significant differences, according to a new study published on Tuesday that does little to resolve the mystery of injuries the Trump administration had characterized as a “sonic attack.”

University of Pennsylvania researchers said symptoms described by the embassy workers may be reflected in their brain scans when compared with those of healthy volunteers.

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The difference between the brains of the workers and people in a control group “is pretty jaw-dropping at the moment,” lead researcher Dr. Ragini Verma, a professor of radiology at Penn, told Reuters in a phone interview.

“Most of these patients had a particular type of symptoms and there is a clinical abnormality that is being reflected in an imaging anomaly,” she said.

However, in findings published by the Journal of the American Medical Association (JAMA), Verma and her colleagues said it is not clear if the brain patterns directly translate into meaningful health problems. Initial MRI scans of 21 Havana embassy workers had revealed no abnormalities.