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The New York Stock Exchange unexpectedly shut down trading in all of its listed stocks Wednesday morning.

The exchange said on Twitter: "The issue we are experiencing is an internal technical issue [tampabay.com] and is not the result of a cyber breach."

A trader on the floor of the exchange in lower Manhattan, who spoke on the condition of anonymity, said that after the suspension began, traders were told that the problem was related to updated software that was rolled out before markets opened Wednesday.