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Sonic cannons to be used during Olympics to keep crowds under control
Ear-piercing: The 'sonic cannon' similar to the one pictured here emits a loud pain-inducing noise. It could be used to disperse crowds during the Olympics
Controversial weapons known as ‘sonic cannons’ will be used during the London Olympics, the Ministry of Defence revealed yesterday.
The devices emit a pain-inducing noise, said to be as loud as a military jet taking off, which can be...
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