ORESTIADA (GREECE), Feb. 29, 2020 (Xinhua) -- Greek riot police patrol at the closed Kastanies border crossing, where migrants gather on the borderline between Greece and Turkey, on Feb. 29, 2020. Greek authorities suspended the operation of the customs post on the land border with Turkey on Friday, as groups of refugees and migrants were gathering on the Turkish side of the border, Greek national news agency AMNA reported. EYEVINE / LEHTIKUVA / DIMITRIS TOSIDIS