U.S. intelligence agencies cannot link a foreign adversary to any of the incidents associated with so-called “Havana syndrome,” the hundreds of cases of brain injuries and other symptoms reported by American personnel around the world.
The findings released Wednesday by U.S. intelligence officials cast doubt on the longstanding suspicions by many people who reported cases that Russia or another country may have been running a global campaign to harass or attack Americans using some form of directed energy.
Most of the cases investigated appear to have different causes, from environmental factors to undiagnosed illnesses, said the officials, who say they have not found a single explanation for most or all of the reports.
Instead, officials say, there is evidence that foreign countries were not involved. In some cases, the U.S. detected among adversarial governments confusion about the allegations and suspicions that Havana syndrome was an American plot. And investigators found …