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Every year, at midday on the 1st Wednesday in May, 1,078 air raid sirens across Denmark are tested. There are 3 signals, but in 2015 I only managed to record the last 2:
12:00: "Go inside"
12:04: "Go inside"
12:08: "Danger is passed"
Lots of information in English here: http://brs.dk/eng/aboutus/Documents/Sounding%20of%20sirens.pdf