What is the Havana syndrome, the evil that is affecting US officials in Colombia?

More than a dozen US officials working at the US Embassy in Colombia and their families have reported symptoms consistent with "Havana syndrome" in recent weeks, according to a US official and a source familiar with the situation.The incidents, now among the hundreds the United States is investigating, come as Secretary of State Tony Blinken plans to visit Bogotá next week. State Department spokesman Ned Price declined to comment on the reported incidents in Colombia or on Blinken's upcoming trip during the department's briefing on Tuesday.