Migrants enter Macedonia near Gevgelija after crossing the border with Greece. Migrants are trekking from the southern Macedonian border near Gevgelija to the northern border with Serbia on their way to Western Europe. Trains carrying hundreds of migrants started arriving in Vienna after Austrian authorities appeared to give up trying to apply European Union rules by filtering out refugees who had already claimed asylum in Hungary.
In the latest twist in a humanitarian and political crisis that is now testing the survival of both Europe's open-border regime and its asylum rules, Hungary allowed the migrants, many of them fleeing Syria's civil war, to cram into at least four trains leaving Budapest for Austria or Germany.
Syrian families wait on train tracks at the Greek-Macedonian border in Idomeni, Greece.