This sound effect can be found on Citi Trax, which was made by The Hollywood Edge. It is a high pitched version of Hollywoodedge, Yelper Siren Multipl PE081101 played in a continuous loop.
Links:
https://soundeffects.fandom.com/wiki/Hollywoodedge,_Police_Whooper_Siren_CT062001#Audio_Samples
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