The Federal Aviation Administration issued a nationwide ground stop for all departing flights on Friday “due to extraordinary circumstances and for reasons of safety.” The extraordinary circumstances weren’t immediately explained, but CBS News that a communications system crashed, causing it to reboot.

CBS News reported around 6:45 p.m. ET that an update to the private communications network which connects the entire country’s air traffic control system was pushed out on Friday. The update crashed the entire system, which is reportedly operated by the tech company L3Harris.

Gizmodo has reached out to L3Harris for comment.

“FAA technicians are investigating the issue”

The ground stop was first issued at 3:54 p.m. ET, according to the Air Traffic Control System Command Center.…