Hmm. Sirens outside, in the middle of the night.

Nothing on the radio, though. What's going on?

Maaan, listening to all that soft-pop on the radio is incredibly annoying.

I dunno, I should probably switch it off. If there wasn't anything on the news yet there probably won't be later, either - right? Heard those sirens maybe half an hour ago, for a minute or so. They were pretty far away, so I'm not sure how long they were already doing their thing - I became aware of them somewhat gradually. Anyway, they're were fairly far away, so whatever it is they were warning of was fairly far away, too. (Not that that's necessarily that reassuring, in case of an, I dunno, accidental release of something really nasty into the environment. Though I don't even know if there's any nasty industries around here.)

What kind of situation usually results in the activation of sirens in the middle of the night?