Hundreds of migrants have spent the night at the closed Serbian border with Hungary.
Many are facing the choice of finding a new route to Northern Europe.
Serbian media said busses were now being redirected to Croatia with migrants then planning to move on to Slovenia, Austria and finally Germany.
New border restrictions and disputes over allocating migrants have shown bitter divisions in europe over the crisis.
Hundreds of migrants spent the night out in the open or in makeshift tents close to the Serbian border with Hungary.
A day earlier new hungarian laws came into effect and police sealed a railway crossing point which had been used by tens of thousands of migrants.
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