Do not be alarmed. On Friday, 15 September 2017 at 12.05pm, SCDF will be sounding the “Important Message” signal through the island-wide Public Warning System (PWS) sirens and the SGSecure Mobile App.
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Tune in to any local radio station for a brief message on the PWS immediately after hearing the signal.
You can also find out more about the PWS by visiting www.scdf.gov.sg
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Source: Singapore Civil Defence Force