Greek police have removed hundreds of migrants from a camp on the border with Macedonia after a protest halted freight trains in the area.
More than 100,000 migrants have arrived in Greece and Italy this year with at least 410 dead or missing, according to the International Organization for Migration.
Greek authorities said the migrants taken from the camp at the border were mostly Afghans and were being bussed to an Army-built refugee camp near Athens.
They had been pleading with Macedonian police to let them cross.
Around 600 protested on the rail line after the country starting barring Afghan migrants at the weekend, and also began reducing the flow of Syrians and Iraqis.
Most of them want to head north to countries such as Germany, which has welcomed more than a million refugees in the last year.
Aid agency the International Rescue Committee called Macedonia”s decision “arbitrary” and said it threatened “to cause serious humanitarian consequences”.
Austria has also put up another obstacle after it decided last week to cap the daily number of asylum applications and people crossing its territory.
Of the migrants who arrived since the beginning of the year, more than 97,000 landed on the Greek islands and some 7,500 in Italy.
Most deaths – 321 – happened on the perilous eastern Mediterranean route between Turkey and Greece, said the IOM.
People smugglers continue to pack people onto flimsy-looking boats for the short crossing, with capsizings and drownings a regular occurrence.
An average of 2,000 arrive in Greece every day.
Meanwhile, hundreds of migrants at “The Jungle” camp in northern France face an 8pm deadline to move from their makeshift homes.
Bulldozers are set to clear the southern part of the camp unless a French judge gives a last-minute reprieve.
Authorities say around 800 to 1,000 people will be affected, but some charities put the figure at more than 3,400 – including 300 unaccompanied children.