On Tuesday, the State Department confirmed that two more Americans have fallen victim to an ongoing series of mysterious attacks targeting diplomats in Cuba, the Associated Press reports. The new cases bring the total of Americans affected by the assaults to 21.
US authorities first acknowledged the attacks in August, about nine months after diplomats began reporting bizarre sonic experiences and a puzzling spectrum of symptoms, from brain injuries to hearing loss. Despite an international investigation into the attacks, which have also affected Canadian diplomats, authorities and scientists are still baffled as to what kind of weapon or devices could have been used—let alone by whom.
The victims report a range of symptoms including dizziness, nausea, headaches, balance problems, ringing in the ears (tinnitus), nosebleeds, difficulty concentrating and recalling words, permanent hearing loss, and speech problems. There have also been brain injuries, including swelling and concussion.