DALLAS (AP) - Flights at Dallas' two major airports were temporarily halted after air traffic controllers were forced to evacuate a building because of smoke, and the resulting flight delays are expected to continue for hours.

A spokesman for the Federal Aviation Administration says smoke was reported Wednesday in the Terminal Radar Approach Control Center at Dallas-Fort Worth International Airport. Spokesman Lynn Lunsford says the smoke may have been from nearby construction.

The control center is separate from the airport tower and directs air traffic across a much broader region. That means flights were also disrupted at Dallas Love Field about 15 miles (24 kilometers) away.

A spokeswoman says two American Airlines flights and two Southwest Airlines flights on their way to Dallas were diverted to Clinton National Airport in Little Rock, Arkansas.

Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.