What to do if the Principality's danger warning sirens sound?

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Siren warning hi-res stock photography and images - Alamy

What does it mean if I hear storm sirens in my neighborhood?

Fire truck sirens: A tale of the wail

10W 110dB Mini Siren Alarm 12V/24V High Sound Electric Horn with High-frequency Flashing Light,Sound and Visual Alarm for Home Security Alarm System : : Home Improvement

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Siren warning hi-res stock photography and images - Alamy

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