Audio as a weapon


I would like to deviate a bit from the normal audio equipment conversation and delve into the phenomenon of the recent audio "weapon" that appears to have been deployed in Cuba upon State Department employees and now, it appears, in China. I know that very low frequency can be dreadful to listen to but anyone out there have any ideas with regard to how audio could be used as a weapon? It is not my intention to draw speculation of a political nature, I am only interested in the technical aspect of audio as a "weapon". Anyone have any thoughts?
128x128falconquest
Elizabeth- Are you saying the US Govt or the US military does not already have these types of weapons??? Or the capability to detect them? I would be curious as to what you know.
It may not be acoustical. It could be microwave. Theoretically (and I’m out of my depth) frequency modulated microwaves could move the fluid in the head, causing acoustic like side effects.

Or it could be microwaves being used to excite a local acoustical device, kind of like the famous State Dept. Seal bug, but in reverse.