Olympic preparations: A Royal Marines landing craft, top, fitted with an American-made Long Range Acoustic Device (LRAD) at the front, exercises with a patrol craft on the Thames
'Sonic cannons' emitting pain-inducing noise to be used during Olympics to keep crowds under control
The powerful piece of kit which is manufactured in the U.S can be used to disperse crowds at London 2012.
The machines will also be used to control riots at the European Championships.
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