New intelligence about weapons research by American adversaries opens the possibility of a foreign actor behind the mysterious ailments that have injured hundreds of U.S. personnel serving overseas.

New intelligence has led two US intelligence agencies to conclude that it’s possible a small number of mysterious health ailments colloquially termed as Havana Syndrome impacting spies, soldiers and diplomats around the world may have been caused by a “novel weapon” wielded by a foreign actor,

A majority of U.S. intelligence agencies have reaffirmed in an updated assessment that it is "very unlikely" that a foreign adversary was responsible for so-called Havana Syndrome ailments, a U.S. intelligence official said on Friday.