LKS 20160301 thessal1220; Migrants and refugees wait to cross the Greece-Macedonia border near the village of Idomeni, on 1 March, 2016. Macedonian police fired tear gas as some 300 migrants forced their way through a Greek police cordon and raced towards a railway track between the two countries on February 29, 2016. With Austria and Balkan states capping the numbers of migrants entering their soil, there has been a swift buildup along the Greek - Macedonian border with Athens warning that the number of people "trapped" could reach up to 70,000 by next month. / AFP / SAKIS MITROLIDIS - LEHTIKUVA / AFP