From kstp.com:
A computer glitch triggered a sudden plunge in the Dow Jones industrial average at mid-afternoon Tuesday, turning an already bad day in stocks into a head-turning spectacle.
Dow Jones & Co., the media company that manages the well-known index of 30 blue chip stocks, said it discovered shortly before 2 p.m. that its computers weren’t properly handling the day’s huge volume in trades at the New York Stock Exchange.
