Riot police detain a protesting migrant during a rally outside a refugee camp in the village of Diavata, west of Thessaloniki, northern Greece, Thursday, April 4, 2019. Clashes broke out between migrants and Greek police outside a camp in northern Greece, where hundreds gathered following anonymous social media calls for a long trek through heavily guarded Balkan borders to seek asylum in Europe's prosperous heartland. (AP Photo/Giannis Papanikos)
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