Euro 2012 police to use sonic cannon

Polish police will use 'sonic cannons' as part of their crowd control techniques at the Euro 2012 championships this summer. The sound cannon, or Long Range Acoustic Device (LRAD), is a non-lethal weapon that blasts concentrated beams of sound measuring around 150 decibels distances of up to 500m, inducing discomfort, aural pain and headaches in its targets.
Sources: The Sun, Live Science