bei der nächsten demo gehörschutz mitnehmen: G20 protesters blasted by sonic cannon
US police spark outrage by using wartime acoustic weapon to disperse G20 protesters in Pittsburgh
http://www.guardian.co.uk/world/blog/2009/sep/25/sonic-cannon-g20-pittsburgh -- http://joerg.piringer.net http://www.iftaf.org http://www.vegetableorchestra.org
