[Migrants carry their belongings as they leave from a makeshift camp during a police operation at the Greek-Macedonian border near the northern Greek village of Idomeni, Thursday, May 26, 2016. Greek police continue to evacuate the sprawling, makeshift Idomeni refugee camp where more than an estimated 8,400 people have been living for months. (Yannis Kolesidis/ANA-MPA via AP)]GENEVA (AP) — The U.N. refugee agency is expressing concerns that migrants and refugees who have been moved to several sites with "sub-standard conditions" after being evacuated from a makeshift camp near Greece's border town of Idomeni.