https://arstechnica.com/science/2018/06/us-pulls-two-more-from-cuba-amid-puzzling-health-cases-now-affecting-china/

The US government has withdrawn two more US workers from its embassy in Cuba following fresh accounts of bizarre noises followed by an array of symptoms consistent with mild traumatic head injuries, according to a series of reports from the Associated Press.

The two workers are considered “potentially new cases” in mysterious incidents plaguing Cuba and also workers in the US consulate in the Chinese city of Guangzhou, just northwest of Hong Kong.