Alarms & Sirens! is a collection of siren and alarm sounds from around the world... you can get an air raid siren, a nuclear alarm, even an alarm from Star Trek!
Special thanks to freesound.org and contributors guitarguy1985, fonogeno, tedthetrumpet, NoiseCollector, doobit, IFartInUrGeneralDirection, torn.rugged.audio.35, LG, druidus, caesar2164, and Timbre.