Flights in the Dallas area were delayed Wednesday afternoon when air traffic controllers were forced to evacuate the Terminal Radar Approach Control (TRACON) after a report of smoke in the building.

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Authorities are investigating the source of the smoke at Dallas-Fort Worth International Airport, which FAA official Lynn Lunsford said was possibly from ongoing construction work.

A ground stop was put into place to help manage air traffic in the area. DFW TRACON manages airspace across most of North Texas, including at Dallas Love Field.

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Controllers from the TRACON room were relocated to the two control towers at DFW so limited service could resume at the two airports.