He said the government could provide water, food and medical care, but could not register all the people.

The arrival of 13,000 in the space of 48 hours, many crossing fields and some dodging police, has proved too much for one of the EU’s less prosperous states in a crisis that has divided the 28-nation bloc and left it scrambling to respond.

Thousands of refugees are still trapped, as the row continues between two countries at the centre of Europe’s migration crisis.

Croatia, buffeted by thousands of migrants and refugees after Hungary sealed its southern border with Serbia earlier this week, declared it could not take in any more, after initially expressing willingness to allow its territory to be used for transit to wealthier destinations to the north and west. Those who went from Croatia to Slovenia, seeking another way into Austria, faced blocked bridges and determined Slovenian riot police.

Despite Hungary’s hardline stance, it did take in at least 1,000 migrants on Friday from Croatia.

Migrants queue up for buses after they arrived at the border…

Cavkov says “we are anxious , because of the closure of the borders, for migrants in the north”.

On the Croatian border with Slovenia, another European Union member, hundreds of migrants spent the night in the open at the Bregana crossing, state-run HRT television reported. Mr Milanovic said: “We have a heart but we also have a brain”.

“We have seen 140,000 migrants cross our country and only 550 have applied for asylum in Serbia”.

She said she had been travelling for two months with her son, and added: “Look at me”.

“I just want to cross the border”, said a young Syrian student wearing a black Iron Maiden t-shirt, a sad smile on his face. Slovenian police have intercepted dozens of migrants who tried to cross through the forests overnight.

“I didn’t expect such a reaction from Europe…”

Anxious by the situation, Slovenia stopped all rail traffic on the main line from Croatia. His government has said it will receive asylum requests, but not create a “corridor” for refugees to simply pass through Slovenia and into Austria.

The Kandalaft family landed in Greece a week ago and heard the border with Hungary would soon close and that there was a new route through Croatia.

As the body of another child washed up on a Turkish beach, the worldwide Organization for Migration also said almost 474,000 people had so far this year braved perilous trips across the Mediterranean to reach Europe.

Fearing a surge of refugees from Croatia, Austria and Slovenia called Thursday for an urgent, all-EU response.

In his invitation to leaders, European Council President Donald Tusk called the crisis a test of the EU’s “humanity and responsibility”.

Croatia was also putting some migrants on trains to Hungary.

Rocks, smashed bottles and broken sticks littered the ground.

Hungary’s Prime Minister Viktor Orban says that his country has started building a razor-wire fence along a stretch of its border with Croatia to keep migrants from entering the country in that area.

The refugees who were on board the train to the town of Magyarboly are being transferred to a reception camp and the train driver has been arrested, according to Sky News.

On Friday, Berlin warned it could invoke EU’s majority voting system to force reluctant states to accept quotas of migrants. Police first said they would be sent back, but then the train proceeded to the town of Postojna, some 50 km (30 miles) southwest of the capital Ljubljana, where there is a refugee centre.

German Economy Minister Sigmar Gabriel renewed a threat that countries that do not help in the migrant crisis will be deprived of European Union funds.