Posters with pictures of missing migrants are attached to a container at Serbia's border with Hungary near a makeshift camp for migrants in Horgos, Serbia, Tuesday, March 28, 2017. Hungary's new legislation allowing for the placement of all asylum-seekers in border container camps took effect Tuesday, with the European Union's commissioner for migration saying that it needs to comply with the bloc's rules. (AP Photo/Darko Vojinovic)

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