Ground Stop issued at O'Hare airport after fire alarm goes off in air traffic control tower: FAA

CHICAGO (WLS) -- A Ground Stop was issued at Chicago O'Hare International Airport Wednesday afternoon after a fire alarm went off in an air traffic control tower, the Federal Aviation Administration said.

The incident happened at the North Control Tower, officials said.

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A Ground Stop delayed departures at O'Hare between 3:20 and 4:30 p.m. Wednesday, according to FAA alerts.

No fire was observed and the alarm was determined to be false, the FAA said.

No further information about the incident was immediately available.