Accidents happen, however... This system should not be prone to errors like this. Maybe someone did maintainance on the system and while doing a test
alarm, forgot to turn off the line/modem/transmission unit.
OR it was yet again some kiddy using sh**an, meta****t and some of his internet time.
I've never seen a warning test in the UK or even heard any sirens.
I have no idea if we even have such a system here, I'm imagining these days a mass text to every mobile phone would be the most efficient, as well as
TV.