Thanks to Matt Fuller for this link:

http://www.guardian.co.uk/sport/2012/may/12/british-military-sonic-weapon-olympics

and here is another:
http://www.bbc.co.uk/news/uk-england-london-18042528

Am always reminded of the LRAD’s inventor, Woody Norris’ telling statement: “in the gap between killing something and doing nothing. . .” is where the LRAD fits – that’s a pretty big remit, son.