If the evacuation horn sounds unintentionally, what action should be taken?

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When an evacuation horn sounds unintentionally, the priority is to stop the audible alert to prevent unnecessary panic while you verify the situation. Silencing the horn accomplishes this by quieting the noise without turning the safety system off or removing its protection, so authorized personnel can investigate, correct the cause, and re-arm if needed. Disabling or disconnecting the horn could disable a safety device and leave you vulnerable in a real emergency, and ignoring the alarm can lead to confusion and unsafe conditions.