A police officer works inside the operation center at the village of Nea Vyssa near the Greek-Turkish border, in Greece, Friday, May 21, 2021. An automated hi-tech surveillance network being built on the Greek-Turkish border aiming at detecting migrants early and deterring them from crossing, with river and land patrols using searchlights and long-range acoustic devices. (AP Photo/Giannis Papanikos)
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