A Sudanese migrant sits under a trap door used to avoid police operations at an abandoned old textile factory in the southern Greek city of Patras. (May 28, 2015)

An Afghan migrant tries to hide on a truck traveling to Italy from the southern Greek city of Patras. (May 28, 2015)

Sudanese migrants stand in an abandoned old textile factory in the southern Greek city of Patras. (May 28, 2015)

Afghan migrants try to enter the port and hide under trucks for an illegal travel to Italy from the southern Greek city of Patras. (May 28, 2015)

An Afghan migrant prays at an abandoned old wood factory in the southern Greek city of Patras. (May 28, 2015)

A Syrian migrant holds up her daughter as lifejackets float on the water after their arrival from Turkish coasts at a beach in Mytilene, on the northeastern Greek island of Lesbos.(June 16, 2015)

Syrian migrants react as they arrive in an overcrowded dinghy from the Turkish coast at a Mytilene beach, on the northeastern Greek island of Lesvos. (June 18, 2015)

A Greek coast guard vessel uses its light to give directions at a dinghy overcrowded with Syrian migrants in Mytilene, on the northeastern Greek island of Lesbos. (June 16, 2015)

A Greek coast guard vessel uses a light to spot migrants arrive on an overcrowded dinghy from Turkish coast during a patrol operation near the port of Mytilene on the Greek island of Lesbos. (June 18, 2015)

A Greek coast guard vessel uses a light to spot migrants arrive on an overcrowded dinghy from Turkish coasts during a patrol operation near the port of Mytilene on the Greek island of Lesbos. (June 18, 2015)

A father gives his son to a coast guard officer, second left, as he disembarks from a vessel at the port of Mytilene after being picked up by the Greek coast guard near the northeast Greek island of Lesbos. (June 17, 2015)

Migrants take a shower at a refugee and migrant camp in the village of Moria on the northeastern Greek island of Lesbos. (June 17, 2015)

A girl walks at a refugee and migrant camp as graffiti is displayed on a wall of a former military base in the village of Moria on the northeastern Greek island of Lesbos. (June 17, 2015)

A Syrian mother holds her ten month-old son Ahmad after their arrival at a refugee and migrant camp in the village of Moria on the northeastern Greek island of Lesbos. (June 17, 2015)

A Syrian migrant checks his cell phone as other migrants' devices charge at an old indoor swimming pool in Mytilene, on the northeastern Greek island of Lesbos. (June 16, 2015)

Police and coast guard scuffle with Syrians during a protest by refugees and migrants, demanding better living conditions and faster processing of their asylum registrations at the port of Mytilene, on the northern Greek island of Lesbos. (June 17, 2015)

A barefoot migrants boy arrives from the northeastern Greek island of Lesbos to the Athens' port of Piraeus. (September 8, 2015)

A Syrian migrant with a life jacket runs barefoot to his compatriots as he holds wet clothes after an arrival in the suburbs of Mytilene with an overcrowded dinghy from a Turkish coast to the Greek island of Lesbos. (June 18, 2015)

Refugees and migrants wait to enter a bus, transporting them to the metro station, after their arrival from the northeastern Greek island of Lesbos to the Athens' port of Piraeus (September 7, 2015)

A migrant woman holds a baby after their arrival from the Greek island of Lesbos at Athens' port of Piraeus. (September 28, 2015)

A traveler passes next to an Afghan migrant woman who breastfeeds her baby at the Athens' port of Piraeus. (September 7, 2015)

Commuters are reflected in tiles as they use an escalator as an Afghan woman and her two children, their belongings packed in plastic bags, wait out a rainstorm in the underground Victoria metro station in central Athens. (September 22, 2015)

A local resident offers grapes to an Afghan migrant as they sit at Victoria square, Athens. (September 2, 2015)

A child plays at a migrant transit camp outside the Greek town of Orestiada, near the Greek-Turkish border. (January 2016)

Refugees try to warm up around a fire as the sun rises at a refugee camp in the northern Greek village of Idomeni. (January 21, 2016)

People form a line as they wait to receive food distributed by non-governmental organizations at a refugee camp in the northern Greek village of Idomeni. (January 21, 2016).

A child stands with other refugees around a fire to warm up in freezing temperatures at a refugee camp in the northern Greek village of Idomeni. (January 21, 2016)

A protester walks behind a banner that reads ''Evros,'' a northeastern border region of Greece with Turkey, during a rally at the town of Orestiada. (January 24, 2016)

A man holds a baby as refugees and migrants wait to enmbark a military van, on a highway near the northeastern Greek village of Thourio, at the Greek-Turkish border. (January 24, 2016)

A refugee makes the victory sign inside a military van on a highway near the northeastern Greek village of Thourio, at the Greek-Turkish border. (January 24, 2016)

A man from Libya hangs his wet shoe laces on a fence at the Hellenikon shelter, a former Olympic field hockey venue, in southern Athens. (January 10, 2016)

A Palestinian cuts the hair of a compatriot at the Eleonas refugee camp in Athens. (January 9, 2016)

Iranians play volleyball at the Hellenikon shelter, a former Olympic field hockey venue, in southern Athens. (January 10, 2016)

A child plays with the pigeons as a Greek flag waves at a small refugee camp at Pothia port, on the southeastern Greek island of Kalymnos. (February 1, 2016)

Migrants walk inside a building at a refugee camp at Lakki port on the southeastern Greek island of Leros. (February 2, 2016)

Migrants and refugees disembark from a ferry after their arrival along with hundreds of others from the eastern Greek islands to the Athens' port of Piraeus. (February 23, 2016)

Refugees and migrants wait in a queue as the sun rises, to receive food distributed by non-governmental organization after their arrival from the eastern Greek islands to the Athens' port of Piraeus. (February 25, 2016)

Afghan migrants rest near a boat that is being stored at a warehouse , which is used as a shelter for refugees and migrants at the Athens' port of Piraeus. (February 29, 2016)

Afghan migrants arrive at a warehouse, which is being used as a shelter for refugees and migrants at the Athens' port of Piraeus. (February 29, 2016)

Migrants, mostly from Afghanistan, queue to receive food distributed by Greek army at a transit camp in the western Athens' suburb of Schisto. (February 25, 2016)

Migrants rest inside the old international airport, which is used as a shelter for refugees and migrants, in southern Athens. (February 26, 2016)

Refugees and migrants, mostly from Afghanistan, wait in queues to receive food distributed by the Greek army at a transit camp in the western Athens' suburb of Schisto. (February 25, 2016)

An elderly woman sleeps on a pavement next to a wheel chair, at the old international airport which is used as a shelter for refugees and migrants, in southern Athens. (February 26, 2016)

A man holds up a girl as Syrian refugees demand to open the border during a protest at the Athens' port of Piraeus. (February 26, 2016)

Children from Syria play on truck trailers at the Athens' port of Piraeus where over 2,000 stranded refugees and migrants stay at the passenger terminal buildings and their tents. (March 7, 2016)

Exhausted refugees and migrants wait at the Athens' port of Piraeus. (February 26, 2016)

An Iraqi child wears a carnival mask as he plays with a toy scooter in Piraeus, near Athens. (March 8, 2016)

A Syrian refugee shout slogans as he demands with others to open the border during a protest at the Athens' port of Piraeus. (February 26, 2016)

A boy holds his brother as they rest at a terminal building after the arrival of hundreds refugees and migrants from the eastern Greek islands to the Athens' port of Piraeus. (February 23, 2016)

A child drinks his milk as refugees and migrants, who spent another night at a terminal building, wait to be allowed to continue their trip from the Athens' port of Piraeus. (February 26, 2016)

Afghan women wash and dry their clothes in Piraeus, near Athens. (March 8, 2016)

A migrant boy presses his face against the window of a bus at the Athens' port of Piraeus. (March 10, 2016)

An Afghan woman with her one-year old child sits at the old international airport, which is used as a shelter for refugees and migrants, in southern Athens. (March 8, 2016)

An Afghan boy drinks milk at a refugee camp in the western Athens' suburb of Schisto, Thursday, March 17, 2016. European Union leaders will push ahead Thursday with contested plans to send tens of thousands of migrants back to Turkey amid deep divisions over how to manage Europe's biggest refugee emergency in decades. (AP Photo/Thanassis Stavrakis)

An Afghan migrant sits on a bollard in front of a docked ferry at the Athens port of Piraeus. (May 13, 2016)

An Afghan girl counts in Greek the numbers on the wall during a lesson by a non governmental organization at a refugee camp in the western Athens' suburb of Schisto. (September 22, 2016)

A man boils a kettle at an electricity point in the building of the Kalochori refugee camp, set up in a disused supermarket, on the outskirts of the northern Greek city of Thessaloniki. (November 8, 2016)

Children play inside a building at the Kalochori refugee camp, set up in a disused supermarket, on the outskirts of the northern Greek city of Thessaloniki on Tuesday, (November 8, 2016)

Piles of life jackets used by refugees and migrants lie at a dump in Molyvos village, on the northeastern Greek island of Lesbos. (March 16, 2017)

A migrant woman passes graffiti on the wall as she carries supplies at the refugee camp of Ritsona about 86 kilometers (53 miles) north of Athens. (March 14, 2017)