Steve Dorsey, CBS News
The latest assessments of the attacks injuring Americans and Canadians in Havana, Cuba, by U.S. intelligence analysts point to inaudible sound as the culprit -- ultra- and infrasonic waves -- according to a source familiar with the incidents that began in November 2016. However, the source says analysts are still working to rule out other technology.
Medical records show American doctors diagnosed victims with hearing loss, mild traumatic brain injury and likely nerve damage.
"Sound that we can't hear--both ultrasonic, above our hearing range, and [infrasonic] below our hearing range--can damage hearing too," according to Dr. Michael Hoa, an ear surgeon at Georgetown University Hospital.
