Police officers patrol among tents during evacuation operations Tuesday at the Idomeni camp near the Greek-Macedonian border. Yannis Kolesidis/AFP/Getty Images hide caption

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Yannis Kolesidis/AFP/Getty Images

Men carry a coffin during the arrival of migrants and refugees in the port of Messina following a rescue operation at sea by the Italian Coast Guard ship "Diciotti" on March 17 in Sicily. After several quiet weeks, March saw a pickup in the flow of migrants attempting to reach Italy via Libya, a route through which about 330,000 people have made it to Europe since the start of 2014. Giovanni Isolino/AFP/Getty Images hide caption

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A sinking boat is seen behind a Turkish gendarme off the coast of Canakkale's Bademli district on Saturday. At least 35 migrants drowned when their boat sank in the Aegean Sea while trying to cross from Turkey to Greece. Ozan Kose/AFP/Getty Images hide caption

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Ozan Kose/AFP/Getty Images

A policeman on horseback and other officers lead a group of refugees and migrants near Dobova, Slovenia, Tuesday. Slovenia's parliament is expected to approve a measure to have the army help police guard the border with Croatia. Srdjan Zivulovic /Reuters /Landov hide caption

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Srdjan Zivulovic /Reuters /Landov

Crowds Of Migrants And Refugees Prompt Slovenia To Deploy Army

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Refugees and other migrants wait to board buses at Tovarnik railway station in Croatia after crossing from Serbia on Friday. Officials say they were forced to close eight road border crossings Thursday after thousands of people entered the country when Hungary fenced off its border with Serbia earlier this week. Jeff J Mitchell/Getty Images hide caption

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Osama Abdul Mohsen (left) has the promise of a new job in Spain, where soccer officials invited him to come live. He's seen here with his son Zaid as they arrive at the Barcelona train station Wednesday. Manu Fernandez/AP hide caption

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Manu Fernandez/AP

Hungarian border police talk next to a fence, next to a woman who is among hundreds of refugees and migrants caught behind a fence at the Hungarian border with Serbia Wednesday. Armend Nimani/AFP/Getty Images hide caption

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A young man and his son lean on a border stone after they were stopped by Hungarian soldiers Tuesday at the border exit between Serbia and Hungary in Asotthalom near Roszke, southern Hungary. Matthias Schrader/AP hide caption

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Matthias Schrader/AP

Camerawoman Petra Laszlo trips a migrant holding a young boy as he tries to run past a police collection point in Hungary. "I'm not a heartless, racist, children-kicking camerawoman," Laszlo later said. Stephan Richter/Twitter hide caption

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Stephan Richter/Twitter

A man is confronted by a Hungarian police officer with a dog as he holds his daughter in an area where migrants ran over a motorway from a collection point set up to transport people to camps in Morahalom, Hungary, Wednesday. Dan Kitwood/Getty Images hide caption

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Migrants who crossed the border from Serbia into Hungary Monday night use a fire to keep warm at dawn at a collection point Tuesday. So far in 2015, more than 367,000 refugees and migrants have crossed the Mediterranean to seek safety and better prospects in Europe, the U.N. says. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images