Tents at the Brezice transit camp in Slovenia were reportedly set on fire by migrants, who were discontent with the slow process of registration and the poor living conditions.

According to witnesses, the migrants complained of the lack of food, water and blankets and the slow process of moving them to the Austrian border, the BBC reports.

Slovenia is one of the countries most heavily affected by the influx of refugees headed to western Europe as it stands on the Western Balkans migratory route.

Earlier on Wednesday, European Commission President Jean-Claude Juncker summoned a leaders' meeting in view of the unfolding emergency in the countries along the Western Balkans route.

Last week, Hungary closed its borders with Croatia and Serbia, refusing to let any more refugees cross into the country due to security concerns.

As a result, the migrants have been diverted to Slovenia, with nearly 20 000 having arrived in the country since last week.

Although the Slovenian army and police are working hard to address the refugee wave, the country is overwhelmed as it could take only 2500 migrants a day.