A police officer works inside the operation center at the village of Nea Vyssa near the Greek-Turkish border, Greece. An automated hi-tech surveillance network being built on the Greek-Turkish border aims to detect migrants early and deter them from crossing, with river and land patrols using searchlights and long-range acoustic devices. — AP
PEPLO, Greece: As the world begins to travel again, Europe is sending migrants a loud message: Stay away!
Greek border police are firing bursts of deafening noise from an armoured truck over the frontier into Turkey. Mounted on the vehicle, the long-range acoustic device, or “sound cannon”, is the size of a small TV set but can match the volume of a jet engine.
