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The Greek government and the UN refugee agency have brought in extra staff and ships to deal with some 25,000 stranded migrants on the island of Lesbos, the BBC reported.

A processing centre has been also set up on an abandoned football ground to help the migrants to get to Athens. A Greek minister said on Monday Lesbos was "on the verge of an explosion".

Meanwhile, hundreds of migrants broke through police lines on Hungary's border with Serbia and started walking towards the capital, Budapest.

Scuffles had erupted at a cornfield in Roszke where a poorly equipped migrant holding centre has been set up. Stones were thrown at officers, who responded with pepper spray.

About 300 migrants were later seen walking the wrong way along a motorway, escorted by police officers, though they later agreed to be taken by bus to another reception centre.

Further south, the BBC's James Reynolds reports queues 100m (330 feet) long of migrants waiting to pass from Macedonia into Serbia.

Hungary has become a bottleneck as thousands of migrants and refugees from the Middle East and Africa move north to claim asylum in Germany and other countries.

About 20,000 migrants made their way from Hungary into Austria and Germany over the weekend. German Chancellor Angela Merkel has warned that the "breathtaking" flow of migrants into Germany will change the country in the coming years.