Wall St. rollercoaster: Stocks fall nearly 10 pct

May 6, 2010 8:41:39 PM PDT
A computerized selloff possibly caused by a simple typographical error triggered one of the most turbulent days in Wall Street history Thursday and sent the Dow Jones industrials to a loss of almost 1,000 points, nearly a tenth of their value, in less than half an hour. It was the biggest drop ever during a trading day.