The Federal Aviation Administration on Friday suddenly issued a rare nationwide ground stop for all U.S. airports, including Salt Lake City International Airport.

Transportation Secretary Sean Duffy announced in an X post that the stop order follows a “communication issue” affecting Air Traffic Control Centers.

An advisory from the FAA stated the ground stop was issued due to “extraordinary circumstances and for reasons of safety,” The New York Times reported.

Shortly after the advisory was posted, the FAA website that lists air traffic control notices appeared to have gone down, according to The New York Times.

The advisory had stated that all departing traffic should be stopped until further notice, but landings of inbound international flights will be managed on a “case-by-case basis,” according to The New York Times.

The F.A.A. last grounded flights nationwide in 2023, according to The New York Times, when a computer outage resulted in thousands of delayed flights.

The Salt Lake City International Airport is aware of the ground stop, the airport shared on X, noting the FAA did not immediately have an estimated time for a return to service.

The airport is working with its stores and restaurants to support passengers whose travel has been “unexpectedly impacted,” according to the post.

— This is a developing story. Check back for updates.