German police guide a group of migrants after they crossed the border between Austria and Germany near Passau, Germany, on Wednesday. The massive influx of migrants this year has stirred debate about Europe's open borders policy. Kerstin Joensson/AP hide caption

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Migrants walk toward Austria from a camp in Sentilj, Slovenia, on Sunday. Many migrants are from Syria and are sometimes from opposite sides of the country's war. Petr David Josek/AP hide caption

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Monzer Omar (right) gives his friend Hatem Alhees a shave after they and hundreds of other Syrian refugees spent the night in a city park in Budapest, Hungary. NPR has followed Omar on his journey from Turkey to central Europe. Joanna Kakissis for NPR hide caption

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Hungarian police guard hundreds of migrants and refugees sleeping in a cornfield near an overcrowded detention center on the Hungary-Serbia border. Lauren Frayer for NPR hide caption

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Syrian migrants at a train station in Keleti, Hungary, wait for a train bound for Munich, Germany, on Wednesday. As more migrants reach Germany, it is encouraging more in the Middle East to make the journey, according to some aid workers. Win McNamee/Getty Images hide caption

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Images of dead bodies in Syrian prisons, taken by a Syrian forensic photographer, were displayed at the United Nations earlier this year. They were also put on exhibit at the U.S. Capitol in July. Lucas Jackson/Reuters/Landov hide caption

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Dalaa al-Aydi, 4, and her family left Syria just before the start of the civil war. Her only memory of Damascus is, "Takh, takh," the sounds she makes mimicking the gunfire. Holly Pickett for NPR hide caption

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Inspektor Jan Gieber of Austrian police shows the inside of the large van outside the police station in Braunau, Upper Austria, on Sunday, where the children were found among 26 migrants trying to reach Europe. Daniel Scharinger/EPA/Landov hide caption

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Katherine Streeter for NPR

U.S. Bradley fighting vehicles take part in a joint exercise with Georgia at a military base near Tbilisi. Bradleys would be deployed to NATO member states in Eastern Europe and the Baltics if a Pentagon proposal is approved. Zurab Kurtsikidze/EPA/Landov hide caption

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