http://www.haaretz.com/hasen/spages/584191.html
Israel uses sound technology to disperse riot
On Friday, the IDF unveiled a new crowd-dispersal tactic, emitting painful bursts of sound at a special frequency to help break up the demonstration, military officials and witnesses said.
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This probably was a Long Range Acoustic Device (LRAD), a product of American Technology Corporation.
See the following for capabilities brochure style details:
<http://www.atcsd.com/gov.html >
Reportedly, some American units in Iraq are also equipped with this weapon.
See...
<http://www.cnn.com/2004/TECH/ptech/03/03/sonic.weapon.ap/ >
.d.