Balkans

Tens of thousands of migrants and refugees are working their way north through the Balkans.

Afghan migrants waited after being detained by Hungarian police on Sunday in Asotthalom, after crossing the Serbia-Hungary border. Sergey Ponomarev for The New York Times

More than 40,000 people have crossed into Macedonia in the past two months. Last weekend, 7,000 people moved on to Serbia, according to the United Nations. Passageway Masses of migrants and refugees, many from Syria, Afghanistan and Kosovo, have been overwhelming border authorities in several Balkan countries as they try to reach Western Europe. The migrants travel in groups of just a few to dozens, moving north by bus, train, taxi or van. Serbian news media reported that some 70 buses of migrants entered the capital, Belgrade, on Sunday. Migrants in Macedonia told reporters that they were especially eager to move after Hungary said it planned to complete a fence along its 109-mile border with Serbia by Monday.