Thousands more migrants entered Austria over the weekend as European leaders are set to push for a unified response to the crisis.

Austrian authorities are expecting more arrivals from Hungary on Monday.

Foreign ministers from four eastern European countries are holding talks on the crisis later, kicking off a week of intense diplomatic activity.

EU interior ministers are to meet on Tuesday, with leaders convening for an extraordinary summit the following day.

The crisis has exposed deep divisions among European states.

French President Francois Hollande has said in the EU, "no-one can be exempt" from taking in people with the right to asylum, while European Council President Donald Tusk said that the EU should help Syrian refugees to "a better life closer to their homes".

But at the meeting due later on Monday, the foreign ministers from Hungary, Poland, Slovakia and the Czech Republic are expected to reaffirm their opposition to Germany's call for a more even distribution of migrants.

Over the weekend, thousands of migrants continued to cross borders in southern and eastern Europe, many hoping to reach Germany and Scandinavia.

Austria welcomed 10,000 people on Saturday and predicted the same for Sunday.

In the town of Nickelsdorf on the border with Hungary, where hundreds of people have been camped out, two buses arrived during the night at the bus station, reports the BBC's Anna Holligan.

When they arrived, they picked up bottles of water and blankets, and then laid down on the concrete to sleep.

It looks a little bit like Armageddon, our correspondent says; there is rubbish everywhere, strewn across the ground; there are people sleeping wherever they can find a space, she says.

Most travelled in from Hungary and Croatia. Budapest is is now rushing to finish a new fence along its Croatian border.

Hungary has reopened its border with Serbia, but with strict controls - its closure earlier in the week sent large numbers of migrants into Croatia.

Croatia initially welcomed the migrants, but then said it was unable to cope with the numbers and moved them over its border with Hungary, which quickly ferried them on to Austria.

On Sunday, there were scuffles in the Croatian border town of Tovarnik as migrants struggled to board a train they believed would take them to Austria.

Croatia's interior minister, Ranko Ostojic, told the BBC the situation was "impossible for a small country" like his, with 27,000 migrants entering in the past five days.

The largest group arriving in Europe are Syrians escaping the conflict there, followed by Afghans, then migrants from Eritrea, Nigeria and Somalia, fleeing war and human rights abuses.

Many migrants reaching the EU from sub-Saharan Africa or the Western Balkans fail to get asylum, as they are classed as economic migrants.

At least 13 migrants, including several children, died when their dinghy and a ferry collided off Turkey, the coastguard said. The boat was on its way to the Greek island of Lesbos.

In a second incident, Greece's coastguard said 26 people were feared missing from a boat, also off Lesbos.

The US has meanwhile said it would increase its worldwide intake of refugees from 70,000 in 2015 to 85,000 next year and 100,000 in 2017.

Source: BBC