Dunno though. From the article:

>But their skepticism vanished when they saw the patients. “There was not one individual on the team who was not convinced that this was a real thing,” Smith said.

and from another article: (https://www.sciencedaily.com/releases/2018/08/180829115456.h...)

>"We have seen this before when the Soviets irradiated the U.S. Embassy in Moscow in the days of the Cold War," he said.

So the Soviets / Russians have form and the symptoms fit. There was also a van seen which could have had the gear:

>...looked outside her home after hearing the disturbing sounds and seen a van speeding away. (https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba...)