The Federal Aviation Administration (FAA) issued a full ground stop on Monday. This stopped every plane from servicing a flight or landing at their airports.

The ground stop came after an alert that North Korea were firing missiles into the sea near Japan.

The FAA made a statement about the grounding. “As a matter of precaution, the FAA temporality paused departures at some airports along the West Coast on Monday night. Full operations resumed in less than 15 minutes. The FAA regularly takes precautionary measures. We are reviewing the process around this ground stop as we do after all such events.”

West Coast airports were affected most by this stoppage, as a few aircrafts that were mid-flight were ordered to land. Flights were stopped for about 10-30 minutes right after the launch, and were asked to “ground stop, all aircraft, all airports.”

The firing from North Korea is yet another measure of Kim Jong Un’s priority to strengthen their military defense program and nuclear weaponry.