India, Nov. 14 -- The US Federal Aviation Administration on Friday afternoon issued a nationwide ground stop on flights due to a frequency outage with ATC controllers. All departures have been halted until further notice, the FAA said in an alert. Over 7,000 flights have been affected.

"FAA issued a nationwide ground stop for all U.S. airports following a communication issue impacting all Air Route Traffic Control Centers," US Transportation Secretary Sean Duffy said in a X post. "FAA technicians are investigating the issue. We will provide immediate updates as we have them."

Journalist Anna Giaritelli shared a FAA release which cited "rolling frequency outage" as the cause of the ground stop. A frequency outage occurs when the radio co...