• 995

    Fire Engine/ Ambulance

  • 1777

    Non-Emergency Ambulance

  • Fire Hazard Reporting

    1800 280 0000

  • General Enquiries

    1800 286 5555

  • 995

    Fire Engine/ Ambulance

  • 1777

    Non-Emergency Ambulance

Public Warning System

The Public Warning System (PWS) is a network of sirens that the SCDF has placed at strategic points throughout the island. The purpose of this system is to warn the public of imminent threats that could endanger lives and property.


The Public Warning System (PWS) Various Signals & Meanings

The Public Warning System will be used to warn of attacks from the air, land or sea, as well as natural and other man-made disasters. The table below shows what the various signals mean. It would be a good idea to memorise them.


SignalsHow It Sounds*SituationWhat It Means
"Alarm" Signal

Public Warning system

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This is sounded when an air raid or shelling is imminent.Move to a shelter immediately.
"All Clear" Signal

Continuous Blast

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This is sounded when the threat is over.You can leave the shelter.
"Important Message" Signal

Pulsating Blast

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This is sounded to alert the population to an important broadcast on the radio.Tune in immediately to any local FM radio station or TV channel.

NOTE: To hear the audio recording of the various Public Warning Signals, click "How it Sounds" in table above.


Annual Island-wide PWS Sounding

Annually, the SCDF will be sounding the "Important Message" signal through the island-wide network of PWS sirens on 15 February and 15 September at 6.20 pm. Do not be alarmed by the minute-long sounding exercise.

The signal will also sound for all smartphones that have the SGSecure mobile app downloaded, and are not on silent or vibration mode. This signal will stop once the message is acknowledged or cease after 20 seconds. This will be followed by a brief text on the PWS sounding.


The annual sounding and broadcast message are part of the SCDF's continuous efforts to familiarise the public with the PWS signals and to raise awareness on how the public should react upon hearing the signal.


Should the public have any queries on the sounding, call the SCDF Hotline at 1800 367 7233.


Contact us for more public education materials on the Public Warning System.