It turns out the app had mistaken an airport drill for a real disaster and sent "Nearby Incident! Unoccupied Airplane crashed into Terminal at Los Angeles."
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Earlier in the morning, LAX tweeted: "LAX is hosting a training exercise from 8am to noon. Emergency vehicles and personnel may be visible on the airfield. This is only a training exercise."
As soon as the Citizen app realized the error, it sent this correction: "LAFD Training Drill. Updated information indicates a training drill is being conducted until noon today. There are no injuries or crashed aircrafts at LAX."
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