Here it's mostly fire departments and town halls that have the sirens, and they are controlled by the town hall, département (one level above) and the interior ministry, so each of these level can decide to blare the sirens it is responsible for.
It basically never happens except in real bad circumstances.
Actually I said "here" but I don't live in France most of the time, and here in Belgium it's only based on the phone network now, no sirens anymore.
Here it's mostly fire departments and town halls that have the sirens, and they are controlled by the town hall, département (one level above) and the interior ministry, so each of these level can decide to blare the sirens it is responsible for.
It basically never happens except in real bad circumstances.
Actually I said "here" but I don't live in France most of the time, and here in Belgium it's only based on the phone network now, no sirens anymore.