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
Hey, win some, lose some. The Navy’s program to make a weapon out of a Frisbee didn’t work out either. I guess that’s the breaks. 
But laser pointers work well against cat attacks, so there’s that.

So take one with you when you go out on safari on the Serengeti.  No, really. Would I lie to you?

Squirrels work well against some humans, too.
Well, I just can't pontificate as well as some, and I'm glad not to be so caught up in such. 
To the OP, there are lots of ways that sonic stuff can affect humans. It's only "news" on a slow news day. 
Any time I call Apple for support, I get Bieberized via music on hold. That is a weapon. Bad neo-soul with heavy auto-tune. Bummer.