A new kind of police siren that emits low-frequency vibrations, is making waves -- quite literally -- in the town of Bartow, Fla. Although pedestrians may find it unpleasant, officers think it's a ...

Air raid sirens were placed on the top of tall buildings - often police stations or similar ... electrically and produced two signals.The first was the warning - a rising and falling signal ...

A police inspector has told the BBC how he was the first to be tricked by a bird mimicking the sound of a siren. Simon Hills said the two-tone impression had officers believing a car was faulty at ...