The company deny it is a weapon and say it can be used to "peacefully resolve uncertain situations"
Sonic Device Deployed In London During Olympics -- BBC
The Ministry of Defence has confirmed a sonic device will be deployed in London during the Olympics.
The American-made Long Range Acoustic Device (LRAD) can be used to send verbal warnings over a long distance or emit a beam of pain-inducing tones.
The equipment was spotted fixed to a landing craft on the Thames at Westminster this week.
The manufacturer denies it is a weapon and the MoD said it would be used "primarily in the loud hailer mode".
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My Comment: I guess they are expecting trouble.