New Research Deepens Havana Syndrome Mystery

Havana Syndrome first baffled officials in 2016 when US diplomats in Cuba's capital reported falling ill and hearing piercing sounds at night, sparking speculation of an attack by a foreign enemy using an unspecified sonar weapon (Credit: AFP)

The mystery of so-called Havana Syndrome, which struck down dozens of US diplomats, deepened Monday as new research found no tangible evidence of brain injury in those affected.

Researchers at the National Institutes of Health (NIH) acknowledged that ongoing symptoms including migraines, chronic dizziness, and depression are still very much real -- even if they cannot yet be explained.