Updated

The Latest on the migration flow in Europe (all times local):

2:35 p.m.

More than 100 migrants who set off on foot toward Hungary to protest EU's closed borders have agreed to end their march and return to the Serbian capital of Belgrade after spending the night out in the open.

The migrants on Wednesday boarded two buses in the town of Indjija, about 40 kilometers (24 miles) north of Belgrade, where they camped overnight at a local gas station. Serbian authorities say some will be taken to centers for asylum-seekers.

Hundreds initially took off Tuesday from Belgrade toward the border with EU member Hungary 200 kilometers (120 miles) away to demand that the border open for people fleeing war and poverty.

More than 6,000 migrants remain stuck in Serbia after Hungary this summer introduced strict limits for asylum-seekers.

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2 p.m.

Police in northern Greece say 214 Syrian refugees have been detained after crossing a river that forms a natural border with Turkey.

Wednesday's announcement marked the second recent mass crossing of the Evros River — 107 refugees were detained in the same border area last week.

A police official told The Associated Press that refugees and other migrants were taking advantage of current low river levels near the border town of Orestiada. The official was not authorized to speak to the news media and asked not to be identified.

Migrants are seeking alternative routes to the European Union after a crackdown on crossings to the Greek islands started in March, as part of an agreement between the EU and Turkey to stop the flow of migrants and refugees to Europe.