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 in what possibly could have been 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.

Sources tell CNBC the erroneous trade may have been made at Citigroup

"We, along with the rest of the financial industry, are investigating to find the source of today's market volatility," Citigroup said in a statement. "At this point we have no evidence that Citi was involved in any erroneous transaction."

According to a person familiar with the probe, one focus is on futures contracts tied to the Standard & Poor's 500 stock index, known as E-mini S&P 500 futures, and in particular a two-minute window in which 16 billion of the futures were sold.

Citigroup's total E-mini volume for the entire day was only 9 billion, suggesting that the origin of the trades was elsewhere, according to someone close to Citigroup's own probe of the situation. The E-minis trade on the CME.

In an interview on CNBC, the New York Stock Exchange's CEO, Duncan Niederauer, said there were no bad trades on the Big Board. He also suggested that it may not have been one bank involved in the the bad trade.

The massive selloff, which began shortly after 2 pm ET, amplified concerns about the spreading European debt crisis as the approval of austerity measures by the Greek Parliament sparked renewed rioting in Athens.

"There is simply a growing recognition that Greece has got to default," banking analyst Dick Bove told CNBC.com. "The riots in the streets showed the decision to repay the debt was not going to be made by the people in Germany, France and Switzerland—it's going to be made by people in Greece and they're not going to repay it."

http://www.thestreet.com/story/10749060/1/stock-market-crash-or-trading-error.html?cm_ven=GOOGLEN NEW YORK (TheStreet) -- The Dow Jones Industrial Average plunged on Thursday afternoon, as the week-long selloff in the markets took a turn for the worse and began the talk of a stock market crash.