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A girl walks through the water as other migrants and refugees helped by volunteers  to disembark from a small boat after their arrival from the Turkish coast on the northeastern Greek island of Lesbos  Monday, Nov. 16, 2015. Greek authorities say 1,244 refugees and economic migrants have been rescued from frail craft in danger over the past three days in the Aegean Sea, as thousands continue to arrive on the Greek islands

Santi Palacios/AP

A girl walks through the water as other migrants and refugees helped by volunteers to disembark from a small boat after their arrival from the Turkish coast on the northeastern Greek island of Lesbos on Monday

A woman takes a selfie after arriving, along with other migrants and refugees, on the Greek island of Lesbos by crossing the Aegean Sea from Turkey on November 13, 2015. EU leaders on November 12 struck an aid-for-cooperation deal with Africa and proposed a summit this year with Turkey in a two-front push with wary partners to tackle an unprecedented migrant crisis

Bulent Kilic/AFP

A woman takes a selfie after arriving, along with other migrants and refugees, on the Greek island of Lesbos by crossing the Aegean Sea from Turkey on Friday

A riot policeman prepares to throw a teas gas canister

Alkis Konstantinidis/Reuters

A riot policeman (L) prepares to throw a teas gas canister as others walk by fires caused by petrol bombs thrown by youths following brief clashes between police and protesters during a 24-hour general strike in central Athens, Greece

rotesting members of the PAME Communist-affiliated union play music outside the Greek parliament

Petros Giannakouris/AP

rotesting members of the PAME Communist-affiliated union play music outside the Greek parliament during a 24-hour nationwide general strike in Athens

TOPSHOTS Refugees and migrants arrive on...TOPSHOTS Refugees and migrants arrive on the Greek Lesbos island after crossing the Aegean Sea from Turkey on November 8, 2015. Lesbos lies on the frontline of a massive migration wave that has swept over Europe, with over 700,000 people crossing the Mediterranean in search of sanctuary this year. Of the 218,000 migrants and refugees who took to the sea in October, 210,000 landed in Greece, mostly in Lesbos. AFP PHOTO / ARIS MESSINISARIS MESSINIS/AFP/Getty Images

Aris Messinis/AFP

Refugees and migrants arrive on the Greek Lesbos island after crossing the Aegean Sea from Turkey

People queue in order to board a ferry at the port of Mytilene on the island of Lesbos, Greece

  © ko Drobnjakovic/AP

People queue in order to board a ferry at the port of Mytilene on the island of Lesbos, Greece

Students shout slogans during a demonstration of thousands of students against government reforms in education in central Athens, Greece, on Monday

Alkis Konstantinidis/Reuters

Students shout slogans during a demonstration of thousands of students against government reforms in education in central Athens, Greece, on Monday

Migrants and refugees prepare to enter a registration camp after crossing the Greece-Macedonia border near Gevgelija on November 2, 2015. More than 218,000 migrants and refugees crossed the Mediterranean to Europe in October -- a monthly record and nearly the same number as in the whole of 2014, the United Nations said November 2. In October, 218,394 people made the perilous crossing -- all but 8,000 of them landing in Greece -- compared to 219,000 arrivals during all of last year, UN figures showed. The soaring numbers of arrivals last month brought to over 744,000 the number of people who have made the journey so far this year.

Nikolay Doychinov/AFP

Migrants and refugees prepare to enter a registration camp after crossing the Greece-Macedonia border near Gevgelija on Monday

A man holds a child after a boat with refugees and migrants sunk while attempting to reach the Greek island of Lesbos from Turkey, on October 28, 2015. At least five migrants including three children, died on October 28, 2015 after four boats sank between Turkey and Greece, as rescue workers searched the sea for dozens more, the Greek coastguard said. The new accidents brought to 34 the number of migrants found dead in Greek waters this month, according to an AFP tally based on data from Greek port police. Since the start of the year, 560,000 migrants and refugees have arrived in Greece by sea, out of over 700,000 who have reached Europe via the Mediterranean, according to the International Office for Migration (IOM). AFP PHOTO / ANGELOS TZORTZINISANGELOS TZORTZINIS/AFP/Getty Images

Angelos Tzortzinis/AFP

A man holds a child after a boat with refugees and migrants sunk while attempting to reach the Greek island of Lesbos from Turkey on Thursday. At least five migrants including three children, died after four boats sank between Turkey and Greece

Refugees and migrants wait to board a bus heading to the Macedonian border after arriving on board the passenger ferries Blue Star Patmos and Eleftherios Venizelos from the islands of Lesbos and Chios at the port of Piraeus on October 21, 2015 in Athens, Greece. Thousands of refugees - mostly fleeing war-torn Syria, Afghanistan and Iraq - attempt daily to cross the Aegean Sea from nearby Turkey on their journey towards Europe

Milos Bicanski/Getty Images

Refugees and migrants wait to board a bus heading to the Macedonian border after arriving on board the passenger ferries Blue Star Patmos and Eleftherios Venizelos from the islands of Lesbos and Chios at the port of Piraeus on Wednesday in Athens, Greece

An elderly woman is pictured after arriving on the Greek island of Lesbos, after crossing the Aegean sea from Turkey

Dimitar Dilkoff/AFP

An elderly woman is pictured after arriving on the Greek island of Lesbos, after crossing the Aegean sea from Turkey. More than 400,000 refugees, mostly Syrians and Afghans, arrived in Greece since early January while dozens were drowned trying to make the crossing. In total 710,000 have entered the EU through Greece and Italy during the same period, according to the European Agency Frontex border surveillance. The migration issue has caused deep divisions within the European Union, which is trying to set the distribution of migrants among its member countries or limit the flow.

Refugees and migrants arrive on a rubber boat on the Greek island of Lesbos after crossing the Aegean sea from Turkey on October 13, 2015. Greece pledged On October 10, 2015 during talks with its EU partners to open its first so-called hotspot reception centre on the island of Lesbos within 10 days under EU efforts to better deal with the massive influx of migrants.

Dimitar Dilkoff/AFP

Refugees and migrants arrive on a rubber boat on the Greek island of Lesbos after crossing the Aegean sea from Turkey on Tuesday

A man carries his child shortly after he arrived, with other refugees and migrants, on the Greek island of Lesbos, after crossing the Aegean sea from Turkey, on October 12, 2015. Greece was hit by a huge new surge in migrants as the United Nations on October 9 approved a European seize-and-destroy military operation against people smugglers in the Mediterranean.

Dimitar Dilkoff/AFP

A man carries his child shortly after he arrived, with other refugees and migrants, on the Greek island of Lesbos, after crossing the Aegean sea from Turkey, on Monday

A migrant woman with her children board a train, after crossing the Greek-Macedonian border, near Gevgelija, on Friday.

Robert Atanasovski/AFP

A migrant woman with her children board a train, after crossing the Greek-Macedonian border, near Gevgelija, on Friday

Refugees and migrants arrive at the island of Lesbos after crossing the Aegean see from Turkey, Greece, 08 October 2015

Yannis Kolesidis/EPA

Refugees and migrants arrive at the island of Lesbos after crossing the Aegean see from Turkey, Greece, on Thursday

Syrian and Afghan refugees warm themselves and dry their clothes around a fire after arriving on a dinghy from the Turkish coast to the northeastern Greek island of Lesbos, early Wednesday, Oct. 7, 2015.

Muhammed Muheisen/AP

Syrian and Afghan refugees warm themselves and dry their clothes around a fire after arriving on a dinghy from the Turkish coast to the northeastern Greek island of Lesbos, early Wednesday

A refugee sleeps outside an abandoned building at the port of Mytilini , Lesbos island , Greece on Tuesday, Oct. 6, 2015. Austrian Chancellor and the Greek premier  visited Lesbos island Tuesday, to view first-hand the impact of the refugee crisis and tour facilities set up to handle the thousands of people who arrive daily

Santi Palacios/AP

A refugee sleeps outside an abandoned building at the port of Mytilini, Lesbos island , Greece on Tuesday

A refugee is helped as she climbs a hill towards the main road after arriving on a dinghy from the Turkish coast to the northeastern Greek island of Lesbos, Friday, Oct. 2 , 2015. The International Organization for Migration says a record number of people have crossed the Mediterranean into Europe this year.

Muhammed Muheisen/AP

A refugee is helped as she climbs a hill towards the main road after arriving on a dinghy from the Turkish coast to the northeastern Greek island of Lesbos on Friday

Migrants and asylum seekers board a train  near the registration camp after crossing the Macedonian-Greek border near Gevgelija on Thursday. Macedonia is a key transit country in the Balkans migration route into the EU, with thousands of asylum seekers and migrants -- many of them from Syria, Afghanistan, Iraq and Somalia -- entering the country every day.

Armend Nimani/AFP

Migrants and asylum seekers board a train near the registration camp after crossing the Macedonian-Greek border near Gevgelija on Thursday. Macedonia is a key transit country in the Balkans migration route into the EU

An Afghan girl sheds a tear upon her arrival with other refugees and migrants to the Greek island of Lesbos after crossing the Aegean sea from Turkey on September 29, 2015. More than half a million migrants and refugees have crossed the Mediterranean to Europe so far this year -- 383,000 of them arriving in Greece, the United Nations said

Aris Messinis/AFP

An Afghan girl sheds a tear upon her arrival with other refugees and migrants to the Greek island of Lesbos after crossing the Aegean sea from Turkey on Tuesday