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CHICAGO (AP) - Air traffic controllers have returned to a regional radar facility where a small electrical fire forced a halt to all incoming and outgoing flights at both of Chicago's airports.

Elgin Fire Capt. Anthony Bialek says a bathroom exhaust fan in a ceiling overheated and melted some wires and smoke was pushed throughout the facility's ventilation system.

The Federal Aviation Administration said all its personnel were evacuated from the Chicago Terminal Radar Approach Control, or TRACON, facility in suburban Elgin at around 11:30 a.m.

Bialek says it took about an hour to find the source of the smoke.

There were no injuries, and controllers have been allowed to resume their work.

At least 20 departures and 16 arrivals were cancelled Tuesday at Lambert-St. Louis International Airport because of the fire. Another 20 flights were diverted to St. Louis from Chicago.

You can check the status of your flight through Lambert's website. Flights are expected to be back on track by Wednesday morning.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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