Havana Syndrome Probably Wasn’t Caused by Foreign Power, US Says
   [1]https://www.bloomberg.com/news/articles/2023-03-01/havana-syndrome-p
   robably-wasn-t-caused-by-foreign-power-us-says
   Most US spy agencies have concluded that a series of unexplained health
   incidents reported by government employees dating back to 2016 were
   “very unlikely” to have been attacks by a foreign adversary, saying
   they probably resulted from normal illnesses or environmental causes.

References

   1. https://www.bloomberg.com/news/articles/2023-03-01/havana-syndrome-probably-wasn-t-caused-by-foreign-power-us-says