How a Mystery Trader With an Algorithm May Have Caused the Flash Crash

Alleged Flash Crash Trader Fights U.S. Extradition

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From a modest stucco house in suburban west London, where jetliners roar overhead on their approach to Heathrow Airport, a small-time trader was about to play a hand in one of the most harrowing moments in Wall Street history.

Navinder Singh Sarao was as anonymous as they come -- little more than a day trader by the standards of the Street.