Greek police started removing hundreds of migrants stranded on the Greek-Macedonian border and blocking rail traffic on Wednesday, a police official and a Reuters eyewitness said.
Some 1,200 people mostly from Pakistan, Morocco and Iran, were stuck near the northern Greek town of Idomeni, demanding to cross into Macedonia to reach northern Europe after non-EU Balkan states began filtering migrants by nationality.
Hundreds of thousands of people streamed into Europe this year, mostly through Greece, but Balkan states began blocking passage last month to all but Syrians, Iraqis and Afghans, who are considered as refugees because they are fleeing war zones.