More than 10,000 migrants and refugees are still stuck in difficult conditions at a camp on the Greek border with Macedonia. The migrants are stranded in Idomeni, unable to continue their journey towards Western Europe.

More than a million refugees and other migrants, who arrived on the Greek islands in smugglers' boats from Turkey, have passed through Greece to Macedonia and other countries on the western Balkan corridor since the beginning of 2015, on their way to Europe's prosperous heartland.

But the route closed this year by Austrian authorities had a domino effect all the way to Macedonia's border with Greece, leaving more than 50,000 people stranded on the Greek side - including about 10,000 at the closed border crossing of Idomeni.

The border closure, and repeated efforts by migrants on the Greek side to force their way into Macedonia, prompted tension between the two governments. Macedonia accused Greece of doing nothing to stop the attempts, and Greece complained of heavy-handed Macedonian police tactics.