Both Fox Business and CNBC are both reporting that the 20 minute crash was caused by a typo. There was trader error in which someone entered a “b” for billion instead of an “m” for million in a trade of Procter and Gamble stock. This called P&G stock to mistakenly lowered considerably, thus triggering an avalanche of program selling. Procter and Gamble is a component of the DJIA.