O'Hare air traffic controllers evacuate tower after water pipe burst, causing flight delays: FAA

CHICAGO (WLS) -- Air traffic controllers were forced to evacuate the center tower at O'Hare airport early Tuesday morning after a water pipe burst.

The evacuation lasted about an hour, starting around 1 a.m.

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Operations had to be shifted to a facility in an office building until controllers in the north and south towers took over operations.

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The incident led to hundreds of flight delays but only a few cancellations. The Federal Aviation Administration is now checking to see if any air traffic control equipment in the tower was damaged.

Flight delays continued into the late morning.

As of 11 a.m., there were delays of about 30 minutes at O'Hare.

ABC News contributed to this report.