[Greek police secure the passage of a bus carrying migrants evacuated from the makeshift camp in Idomeni, Greece, Tuesday, May 24, 2016. Greek authorities sent hundreds of police into the country's largest informal refugee camp Tuesday to support the gradual of evacuation of the Idomeni site on the Macedonian border. (AP Photo/Darko Bandic)]IDOMENI, Greece (AP) — It grew to the size of a small town, becoming a symbol of Europe's closed border policy for migrants and refugees. On Tuesday, Greek authorities began to dismantle it.