A contract worker accidentally triggered an emergency evacuation message on flight status screens at Los Angeles International Airport, a spokesman said.
Travelers noticed the sign and quickly alerted airport officials, the Times said.
Law enforcement officers began searching for who was responsible for the breach and reviewed computer records to determine who may have hacked the system.
But airport officials said at 2 a.m. Tuesday the display of the message was triggered by accident by an airline contract worker with authorized access to the system.
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