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661 crashes, 7 dead and hundreds injured in Pa. during holidays, state police say | LehighValleyNews.com
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Chris Bergin - NSF on Twitter: "🚨🚔T-10 minute police siren for Ship 20 test🚔🚨 https://t.co/zCIrgzb0oI https://t.co/Hutrmt6Za5" / Twitter
How do police sirens work? Does the operator press a button for the siren to turn on/off? Can the operator leave it on for emergency situations? - Quora
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