A telecommunication outage caused Federal Aviation Administration air traffic controllers in Dallas to lose radar and some communications Friday afternoon, leading to flights being stopped at the area’s airports.

“The FAA is slowing flights at Dallas Love Field and Dallas-Fort Worth International Airport due to a reported local telephone company equipment issue,” the FAA said in a statement. “The FAA is working with the telephone company to determine the cause.”

Air traffic controllers rely on telecommunications lines from local phone companies to connect their facilities, including the airport towers and the Terminal Radar Approach Control, which handles flights arriving or departing airports.

“We’ve lost all radar and phone communications,” the controller in the Dallas Love Field Air

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