The Ministry of Defence has confirmed that a device that can be used as a "sonic weapon" will be deployed in London during the Olympics.
The American-built long-range acoustic device (LRAD), which has been used by the US army to control crowds in Iraq, can emit an ear-piercing beam of sound.
An MoD spokesman said the device, which can also be used as a loudspeaker, was among a "broad range of assets" being used by the armed forces to provide security during the Games.
By far the most interesting stream of news about the olympics has been all the various counter-terrorism measures the MoD are taking. The ships on the Thames, the constant shift of snipers in helicopters, 'Sonic weapons' and ground to air missiles stations around London.
It's all rather.. interesting, you know, just thinking about all that active equipment in London.
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