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Public Warning System (Singapore)

The Public Warning System is a network of civil defense sirens installed by the Singapore Civil Defence Force on over 2,000 strategic points in Singapore to warn Singaporeans of impending dangers and air raids. Thus far, the siren network has only been used for occasional public awareness drills, monthly noon chimes and for commemorating the island's Total Defence and Civil Defence Days. It was also used to mark a minute's silence nationwide for the passing of former minister Lee Kuan Yew on the evening of 23 March 2015.