Unknown sirens in Belgrade, Serbia https://www.youtube.com/watch?v=T3QHOpjWhF0
Chicago's 2001s https://www.youtube.com/watch?v=F0m1BN4ZmAQ
A Hörmann F71 and an unknown, higher pitched siren in Israel https://www.youtube.com/watch?v=wFlYw9awR5o
Not my videos.