These are “potentially new cases” of a mystery illness that has plagued embassy employees but the official cautions that the two individuals are undergoing medical evaluations and have not yet been “medically-confirmed.”

In the past, some officials have characterized the incidents at the embassy as “sonic attacks” or “acoustic attacks” because they have often coincided with a high-pitched sound. US officials have detailed how personnel in Cuba came to experience a variety of symptoms including sharp ear pain, headaches, ringing in one ear, vertigo, disorientation, attention issues and signs consistent with mild traumatic brain injury or concussion.