DOW - Blooding flowing in the Wall Street

10,520.32 -347.80 -3.20%

Bloody!!!

Stock Selloff May Have Been Triggered by a Trader Error

In one of the most dizzying half-hours in stock market history, the Dow plunged nearly 1,000 points before paring those losses—all apparently due to a trader error.

According to multiple sources, a trader entered a "b" for billion instead of an "m" for million in a trade possibly involving Procter & Gamble [PG 60.75 -1.41 (-2.27%) ], a component in the Dow. (CNBC's Jim Cramer noted suspicious price movement in P&G stock on air during the height of the market selloff.