1 large trader led to May 6 stock market plunge - Yahoo! Finance

1 large trader led to May 6 stock market plunge - Yahoo! FinanceWASHINGTON (AP) -- A trading firm's use of a computer sell order triggered the May 6 market plunge, which sent the Dow Jones industrial average careening nearly 1,000 points in less than a half-hour, federal regulators said Friday.