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TOPSHOT - A migrant holds a razor wire at the gate on the Greek-Macedonian border, near the Greek village of Idomeni, on March 1, 2016, where thousands of people are stranded. With Austria and Balkan states capping the numbers of migrants entering their soil, there has been a swift build-up along the Greece-Macedonia border with Athens warning that the number of people "trapped" could reach up to 70,000 by next month. / AFP / LOUISA GOULIAMAKI (Photo credit should read LOUISA GOULIAMAKI/AFP via Getty Images)

TOPSHOT - A migrant holds a razor wire at the gate on the Greek-Macedonian border, near the Greek village of Idomeni, on March 1, 2016, where thousands of people are stranded.
With Austria and Balkan states capping the numbers of migrants entering their soil, there has been a swift build-up along the Greece-Macedonia border with Athens warning that the number of people "trapped" could reach up to 70,000 by next month. / AFP / LOUISA GOULIAMAKI        (Photo credit should read LOUISA GOULIAMAKI/AFP via Getty Images)