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G20 protesters could be hit with sonic guns

G20 protesters could be hit with sonic guns 27 May 2010 The addition of sound cannons to the arsenal available to security forces managing G20 protests comes as no surprise to groups planning to demonstrate in Toronto at next month’s summit. They say it’s just one more signal amid an unprecedented security operation that dissenting voices are being muzzled. The sound cannons are capable of emitting ear-piercing and hearing-damaging alerts, not unlike that of a smoke detector, that can be heard up to 1.5 kilometres away.