MANHATTAN (CN) - The New York Stock Exchange resumed trading shortly after 3 p.m. Wednesday, four hours after an apparent technical hiccup forced the exchange to suspend all activity.
The suspension of trading was longest at the exchange in recent memory.
The first sign of trouble appeared soon after the opening bell rang at 9:30 a.m. on Wednesday, when trades of a small number of stocks appeared to get stuck and apparently didn't go through.
Whatever the issue was, it appeared to be resolved, but them reappeared later in the morning on a more widespread basis, forcing the exhange to shut down.
Within minutes it exchange's its market status page bore that message, "NYSE/NYSE MKT has temporarily suspended trading in all symbols. All open orders will be cancelled. Additional information will follow as soon as possible."
Later, through its Twitter account, the exchange said, "The issue we are experiencing is an internal technical issue and is not the result of a cyberbreach."
Trading on other exchanges was not affected.
The issue at the stock exchange came just hours after United Airlines grounded planes nationwide because of what it described as a problem of "network connectivity."
The decision effected all domestic United and Continental Airline flights.
Jeff Smisek, United's chief executive, said the networking issue prevented the airline from dispatching planes, and that it took about 90 minutes for the airline's computer technicians to correct the issue.
The airlines said its technicians are still performing a "root-cause analysis" to determine exactly what the issue was Wednesday morning.
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