[sissyjane]

I think they are using the call to prayer instead of the air-raid sirens.Some one broke it.

[ztiworoh]

Yeah according to a report a few days back they say "God Is Great, he will protect us" when there's a bomb coming, and "God is Great, the Enemy has left us" as an all clear signal

[Catspaw]

I believe you're right about the air raid warning sirens. They've substituted using the mosque loudspeakers and something akin to a call for prayer to warn the populace.