POLITICO: Feds Trace 1,000 Point Dow Flash Crash to Chicago

From Politico.com:

Federal investigators probing the “flash crash” that briefly sliced nearly 1,000 points off the Dow Thursday are zeroing in on a series of “unusually high-volume” trades in S&P futures that originated in Chicago, a government official told POLITICO.

Those trades set off a chain reaction of trades that caused the biggest drop within a single day in the Dow Jones Industrial Average’s storied history.

Officials at the Securities and Exchange Commission and…