Several airports in the Northeastern U.S. stopped their traffic on Friday due to equipment outages, according to the Federal Aviation Administration.
Equipment outages caused ground stops at Baltimore-Washington International Airport, Ronald Reagan Washington National Airport and Washington Dulles International Airport, lasting through at least 7 p.m. Eastern Time.
Specific details of the equipment outages responsible were not immediately available.
The stoppages were forecast to affect airspace from the U.S. East Coast through the Midwest.
There was a medium probability that the ground stops at the affected airports would be extended, according to the FAA.
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A separate ground stop was in effect for Austin-Bergstrom International Airport due to staffing issues.
Arriving flights at Seattle-Tacoma International Airport were also briefly stopped earlier on Friday due to snowy and icy conditions.
As of Friday afternoon, there had been close to 7,000 delays affecting U.S. flights, and 647 cancellations,according to FlightAware.
This is a developing story and will be updated.