In pictures: Europe's migrant crisis
Europe's Migrant Crisis - Sept. 19, 2015
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Migrants and refugees board a train from Vienna to Salzburg at the Westbahnhof train station in Vienna, Sept. 19, 2015.
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Migrants queue up for buses after they arrived at the border between Austria and Hungary near Heiligenkreuz, about 180 kms (110 miles) south of Vienna. Thousands of migrants who had been stuck for days in southeastern Europe started arriving in Austria early Saturday after Hungary escorted them to the border.
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Migrants waiting for buses at the border between Austria and Hungary.
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A migrant man reacts as he is surrounded by Slovenian police at the Slovenia-Croatia border crossing in Rigonce, Slovenia, Sept. 19, 2015.