UPDATE: At least 100 flights at the airport have been delayed by an average time of an hour. It is not clear when operations will return to normal.
Officials at the Fort Worth Air Route Traffic Control Center evacuated non-essential personnel from the building near DFW-International Airport after a report of a strong odor.
“It appears that nearby construction work unearthed some sort of backup in a line,” according to a Federal Aviation Administration spokesman.
Air traffic services are still being handled, but at a reduced rate as they rotate personnel in and out of the building. Air purifiers and fans are in use to circulate fresh air throughout the building.