Every month we hear the air raid alarm, why exactly and who activates it?

Every month we hear the air raid alarm why

It’s quiet today with the reports to the Utrecht Security Region. In a building in the city of Utrecht, two firefighters are sitting behind computer screens in the control room. They joke among themselves, drink their coffee and when the phone rings they are immediately ready. In any case, what will not happen to them again today is that the monthly air raid sirens will not go off.

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