The Federal Aviation Administration has issued a nationwide ground stop impacting all airports, including at Philadelphia International Airport. No flights are permitted to take off.
In a statement, the FAA cited "extraordinary circumstances and for reasons of safety."
US Transportation Secretary Sean Duffy added that there was a communication issue that impacted all Air Route Traffic Control Centers.
The FAA is investigating.
It is not known how long the ground stop will be in place.
It marks only the second nationwide ground stop since the 9/11 attacks, after a pilot notification system was disabled in Jan. 2023.
CNN cites law enforcement sources that do not believe this is the result of a cyberattack, based on preliminary information.
This is a breaking story. More information will be provided as it becomes available.
Sign up for free local newsletters and alerts for the
Philadelphia Patch
Patch.com is the nationwide leader in hyperlocal news.
Visit Patch.com to find your town today.