CIA says 'Havana Syndrome' not result of sustained campaign by hostile power

In a new intelligence assessment, the CIA has ruled out that the mysterious symptoms known as Havana Syndrome are the result of a sustained global campaign by a hostile power aimed at hundreds of U.S. diplomats and spies, six people briefed on the matter told NBC News.

In about two dozen cases, the agency cannot rule out foreign involvement, including many of the cases that originated at the U.S. Embassy in Havana beginning in 2016. Another group of cases is considered unresolved. But in hundreds of other cases of possible symptoms, the agency...