[IMG]http://d.yimg.com/a/p/afp/20100511/capt.p***o_1273548876939-2-0.jpg?x=130&y=86&q=85&sig=Tg_MLjuV4WsWSfjK8ywOew--[/IMG]Reuters - The top securities regulator said no single event had been found to explain Thursday's mysterious market plunge, but the shocking drop was unacceptable and additional safeguards were coming.
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