Balkan countries struggled with a growing backlog of migrants Monday after Hungary sealed its southern border and Slovenia tried to impose a limit, leaving thousands stranded on cold, wet crossing points where tempers frayed.
Having declared it would accept only 2,500 per day, Slovenia said 5,000 had arrived from Croatia on Monday, with another 1,200 on their way by train.
"Croatia is ignoring our pleas, our plans," Bostjan Sefic, state secretary at Slovenia’s interior ministry, told a news conference, saying the army would be called in to help if such a rate continued.
Attempts by Slovenia to ration the flow since Hungary sealed its border with Croatia at midnight on Friday has triggered a knock-on effect through the Balkans; Croatia began holding back new arrivals and Serbia said it may do the same on its border with Macedonia.
More than 10,000 were stranded in Serbia, the United Nations refugee agency (UNHCR) said, with more on the way but nowhere to go.
"It's like a big river of people, and if you stop the flow, you will have floods somewhere. That's what's happening now,” UNHCR spokesman Melita Sunjic said from the Serbia-Croatia border, where about 2,000 people were forced to wait in a muddy, rain-drenched no-man’s land.
Groups of migrants fought with each other in the morning, aid workers said, after a night spent under open skies lashed by autumn wind and rain.
"Open the gate, open the gate!" they chanted, their passage barred by lines of Croatian police who erected an improvised fence to control access. Police began letting through one busload an hour.
Slovenia has found itself dragged into the path of the greatest migration of people in Europe since World War Two after Hungary sealed its border with Croatia to migrants on Friday.
Angry and over-stretched, Croatian police lashed out at journalists on the Berkasovo-Bapska border crossing, hitting a Reuters cameraman and threatening to smash his camera and assaulting and seizing equipment from at least one agency photographer.
Serbia's minister in charge of migration suggested Serbia too may try to stem the flow from Macedonia, proceeding at a rate of around 5,000 per day.
"We have to think about how many people we can take in under such conditions," Aleksandar Vulin told reporters in Berkasovo. "Let’s not blame Serbia when the entire EU is turning its gaze from what's happening here."
Hungary’s right-wing government says the mainly Muslim migrants pose a threat to Europe’s prosperity, security and "Christian values", and has sealed its borders with Serbia and Croatia with a steel fence and new laws that rights groups say deny refugees their right to seek protection.
The European Union has agreed a plan, resisted by Hungary and several other ex-Communist members of the bloc, to share out 120,000 refugees among its members, a small proportion of the 700,000 migrants the International Organization for Migration (IOM) projects will reach Europe’s borders from the Middle East, Africa and Asia this year.