via cnbc.com
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 firm in question that handled the erroneous trade is Citigroup [C 4.04 -0.14 (-3.35%) ]. The bank said it has no evidence of a bad trade but is investigating the situation