Overview

• Frontier flight 3406 from Seattle to Denver was evacuated after crewmembers discovered two anonymous threatening notes aboard.
• Denver police officers and bomb squads bused passengers to the terminal and completed a thorough security sweep that found no explosive devices or hazards.
• The aircraft was cleared and released back into service, allowing passengers to rejoin flights or retrieve their luggage.
• The Federal Bureau of Investigation has assumed control of the investigation to determine who authored the threatening notes.
• This incident follows recent security scares at Denver International Airport and highlights the value of established protocols and multiagency coordination.