The New York Stock Exchange resumed floor trading Wednesday afternoon after an apparent technical issue halted trading in all symbols for nearly four hours.

Two U.S. officials said there was no indication of a cyber attack nor a connection between the stock exchange outage and a computer glitch that grounded thousands of United Airlines flights around the world earlier Wednesday. Two major cybersecurity firms, FireEye and Mandiant, also said the issue appeared to be the result of a technical glitch rather than hacking.

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