In pictureL A look at Europe's migrant crisis
Kriza e imigrantëve - 13 shtator, 2015
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Migrants and refugees walk through a field to avoid checkpoints along the railway tracks connecting Horgos and Szeged near Roszke, at the border between Hungary and Serbia.
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A girl peeps out from a tent at a park where hundreds of migrants are temporarily residing in Belgrade, Serbia. Hungary plans to start enforcing tougher security on its border with Serbia starting Sep. 15.
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A man watches from a border tower in Serbia near the Hungarian village Roszke, southern Hungary, Sept. 12, 2015. Hundreds of thousands of Syrian refugees and others are still making their way slowly across Europe, seeking shelter where they can, taking a bus or a train where one is available, walking where it isn't.
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Migrants and refugees wait for buses after crossing the border between Hungary and Austria in Nickelsdorf, Austria, 70 kilometers (43 miles) southeast of Vienna.