Scientists have identified 'significant differences' in the brains of the diplomats 'attacked' in Cuba. The phenomenon, which targeted embassy personnel in Havana and sparked a breakdown of international relations between Cuba and the United States, was first made public in August 2017. Rumored to have involved the use of sonic weapons, the attacks had been directly targeting the hotel rooms of US diplomats, inducing a range of symptoms that included hearing loss, dizziness, balance problems, visual complaints, headache, fatigue, cognitive issues and difficulty sleeping. Now following a study of those affected, researchers at the University of Pennsylvania have revealed that the brains of the victims showed "significant differences" when compared to a control group. Whether or not the "attacks" directly caused these differences however remains unclear. As things stand, the government has yet to conclusively explain the phenomenon. Cuban Neuroscience Center chief Dr. Mitchell Joseph