That is quite a bizarre event, if ever there was one. I'm finding for details and it seems like this is caused by a failure in the FAA's NOTAM (Notice to Air Missions) system - which alerts pilots and other flight personnel about hazards or any changes to airport facility services and relevant procedures.

Update: It took the FAA long enough to provide an update but it seems like the system is still down as per the tweet below.

/US Dollar