Thousands of people, many fleeing war and persecution, are trying to reach northern Europe to claim asylum.

EU states are engaged in a flurry of diplomatic activity to find a solution.

The crisis has highlighted the limitations of the EU’s system for coping with refugees, the BBC’s Chris Morris says.

Under an EU rule known as the Dublin Regulation, refugees should seek asylum in the first EU country they enter. But with countries such as Italy and Greece saying they cannot cope with the numbers, many have headed north.

Hungary had earlier appeared to abandon efforts to register migrants, allowing huge numbers to board trains at Keleti station in east Budapest and travel to Vienna and southern Germany on Monday. source