Sonic Warfare Erupts in Pittsburgh, Honduras

From The Danger Room:

Police in Pittsburgh are using sound blasters and other non-lethal weaponry to ward off protesters at the G-20 summit. The sonic weapon is the LRAD or Long Range Acoustic Device, a super loud-hailer deployed by U.S. forces and famously used to fight off pirates.

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My Comment: I put up the sound for my speakers .... and yes .... the sound is very annoying.