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KOS, GREECE - AUGUST 14: Two Syrian refugees sit at the dock of the port of Kos as the passenger ship "Eleftherios Venizelos" backs into the quay on the Greek island of Kos, August 14, 2015. The Greek government is due to send a cruise ship to the island of Kos which will be able to carry up to 2,500 refugees and operate as a registration centre, after 2,000 Syrian refugees were locked in an old stadium during a registration process and left without water for more than a day. (Photo by Milos Bicanski/Getty Images)
KOS, GREECE - AUGUST 14: Two Syrian refugees sit at the dock of the port of Kos as the passenger ship "Eleftherios Venizelos" backs into the quay on the Greek island of Kos, August 14, 2015. The Greek government is due to send a cruise ship to the island of Kos which will be able to carry up to 2,500 refugees and operate as a registration centre, after 2,000 Syrian refugees were locked in an old stadium during a registration process and left without water for more than a day. (Photo by Milos Bicanski/Getty Images)

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CNN's Hala Gorani speaks to the UNHCR's Melissa Fleming about the ongoing migrant crisis and how Europe must respond.