Stock market traders were shocked in Thursday’s stock market trading at New York Stock Exchange. Dow Jones Industrial Average, one of the US’ main stock index plunged down almost 1,000 points in a short span of 1 hour and 40 minutes.

Initially, there was no apparent reason for the huge stock market decline of the Dow Jones. Some initial analysts reports say that it was due to the ongoing financial problem by Europe particularly that of the one experienced by Greece. However, further investigations lead to the human committed stock market trading error in Citi which was described as the “fat finger” trade.

Accordingly, a stock market trader at Citibank entered a “b” indicating billions of shares as against an “m” for millions of shares possibly involving the stock of Procter & Gamble and 3M, both of which are major component in the Dow Jones stock market index. Procter & Gamble’s shares instantly dropped 37% in the blink of an eye while and 3M plunged down 25%.

After the huge stock market decline, Dow Jones stock market index recovered by a rebound nearly as steep closing down 347.80 points, or 3.2%, to 10,502.32. Securities and Exchange Commission will further investigate the huge stock market decline as a lot of stock market traders benefited in it.