A review by the U.S. National Academies of Science, Engineering and Medicine has determined a directed radio frequency attack is the most likely cause of strange medical symptoms Canadian and U.S. diplomats who served in Cuba experienced. Starting in 2016 several U.S. and Canadian diplomats serving in Havana began to experience strange and unexplained symptoms. They included headaches, dizziness and other cognitive problems. The Academies’ reports, released on Saturday, digs deep into the issues. but can only make a best guess as to what caused the diplomats’ symptoms. It evaluated the radio frequency attack along with the possibility of chemical exposures or some manner of infection.