epa04936500 Hungarian soldiers set up razor wire, the first line of a temporary fence under construction on Hungary's southern border with Croatia near Sarok, Hungary 18 September 2015. Hungary started expanding its fence - already in place at its border with Serbia - at the small north-eastern Croatian stretch between Serbia and Hungary, the only border stretch with Croatia not divided by Danube river. Croatia became the latest flashpoint in Europe's refugee crisis as migrants sought alternative routes to Western Europe after Hungary slammed its doors shut. Hungary on 15 September sealed the last gap in the barricade along its border with Serbia, closing the passage to thousands of refugees and migrants still waiting on the other side and some groups decided to pass over Croatia. EPA/BALAZS MOHAI HUNGARY OUT