Mayor John Street answers questions from the media at news conference in Philadelphia, on Wednesday. The discovery of a hidden listening device in the Mayor's office touched off a political frenzy.

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WARSAW, May 7 (Reuters) - Polish security agents have discovered bugging devices in a room where ministers were due to meet on Tuesday, authorities said, without revealing who might have placed them ...

Audio technology to alert CCTV control rooms to threats – from gunshots to screams – is being implemented or trialed across Britain’s town and city centres. Cameras equipped with sound detection ...