The latest episodes of so-called Havana syndrome, a series of unexplained ailments afflicting U.S. and Canadian diplomats and spies, span the globe. They include two diplomats in Hanoi, Vietnam – which disrupted Vice President Kamala Harris’s foreign travel schedule – in August, several dozen reports at the U.S. Embassy in Vienna earlier this year, and a pair of incidents at the White House last November.
The cause of these incidents is unknown, but speculation in the United States centers on electromagnetic beams.