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Migrants run after breaking Greek police blockade towards the border fence of Macedonia near the Greek village of Idomeni, on February 29 , 2016.Macedonian police fired tear gas on February 29, 2016, as a group of some 300 Iraqi and Syrians forced their way through a Greek police cordon and raced towards a railway track between the two countries. With Austria and Balkan states capping the numbers of migrants entering their soil, there has been a swift buildup along the Greece-Macedonia border with Athens warning that the number of people "trapped" could reach up to 70,000 by next month.
Migrants run after breaking Greek police blockade towards the border fence of Macedonia near the Greek village of Idomeni, on February 29 , 2016.Macedonian police fired tear gas on February 29, 2016, as a group of some 300 Iraqi and Syrians forced their way through a Greek police cordon and raced towards a railway track between the two countries. With Austria and Balkan states capping the numbers of migrants entering their soil, there has been a swift buildup along the Greece-Macedonia border with Athens warning that the number of people "trapped" could reach up to 70,000 by next month.

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    U.N. warns of humanitarian crisis in Europe

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U.N. warns of humanitarian crisis in Europe

Longing for refuge in Germany but stuck in limbo in Greece: That could be the fate of masses of new migrants to Europe, the United Nations warned. CNN's Atika Shubert has more.

U.N. warns of humanitarian crisis in Europe

Longing for refuge in Germany but stuck in limbo in Greece: That could be the fate of masses of new migrants to Europe, the United Nations warned. CNN's Atika Shubert has more.