People gather on the beach as migrants deported from Greece arrive aboard a small Turkish ferry in the port of Dikili district in Izmir, Turkey, on April 4, 2016.
Migrants return from Greece to Turkey begun under the terms of an EU deal that has worried aid groups, as Athens struggles to manage the overload of desperate people on its soil. Over 51,000 refugees and migrants seeking to reach northern Europe are stuck in Greece, after Balkan states sealed their borders. Hundreds more continue to land on the Greek islands every day despite the EU deal. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)