Migrant

A migrant wrapped in a blanket to keep warm waits at a registration camp in southern Serbian town of Presevo on January 22, 2016, after crossing the Macedonian border.  As refugees continued to flow from Greece through the Balkans on their way to western Europe, aid workers sounded alarms over inadequate shelter from the current freezing temperatures and snowy conditions, particularly for children.

Dimitar Dilkoff/AFP

A migrant wrapped in a blanket to keep warm waits at a registration camp in southern Serbian town of Presevo on Friday, after crossing the Macedonian border

An Indian migrant worker stack bricks on his head at a brick factory in Lalitpur, Nepal January 11, 2016

Navesh Chitrakar/Reuters

An Indian migrant worker stack bricks on his head at a brick factory in Lalitpur, Nepal on Monday

A child looks out of a bus window after walking from the Macedonian border into Serbia, in the village of Miratovac, Serbia, Wednesday, Jan. 6, 2016. Hundreds of migrants continue to arrive daily into Serbia in order to register and continue their journey further north towards Western Europe

Visar Kryeziu/AP

A child looks out of a bus window after walking from the Macedonian border into Serbia, in the village of Miratovac, Serbia, Wednesday. Hundreds of migrants continue to arrive daily into Serbia in order to register and continue their journey further north towards Western Europe

A migrant carries her child after crossing the border from Greece into Macedonia, near Gevgelija, Macedonia on Friday. Macedonia, Serbia and other Balkan states have implemented a new policy to filter the flow by granting passage onwards toward Western Europe only to those fleeing conflicts in Syria, Iraq and Afghanistan, who are seen as genuine asylum seekers rather than "economic migrants."

Stoyan Nenov/Reuters

A migrant carries her child after crossing the border from Greece into Macedonia, near Gevgelija, Macedonia on Friday

A migrant child stands on rail tracks while waiting to cross the border from Greece into Macedonia, near Gevgelija, Macedonia November 25, 2015. Countries along the Balkan route taken by hundreds of thousands of migrants seeking refuge in western Europe last week began filtering the flow, granting passage only to those fleeing conflict in Syria, Iraq and Afghanistan

Stoyan Nenov/Reuters

A migrant child stands on rail tracks while waiting to cross the border from Greece into Macedonia, near Gevgelija, Macedonia on Wednesday

A man claiming to be from Iran, with his...A man claiming to be from Iran, with his mouth sewn shut, takes part in a demonstration with fellow migrants and refugees as they wait to cross the Greek-Macedonian border near Idomeni on November 24, 2015. At least five migrants stuck on the Greek-Macedonian border on Monday sewed their lips in protest at not being allowed to continue their journey to Europe. Syrian, Iraqi and Afghan refugees are allowed through but those deemed economic migrants -- mainly people from Iran, Pakistan and Bangladesh -- are blocked. AFP PHOTO /Sakis MitrolidisSAKIS MITROLIDIS/AFP/Getty Images

Sakis Mitrolidis/AFP

A man claiming to be from Iran, with his mouth sewn shut, takes part in a demonstration with fellow migrants and refugees as they wait to cross the Greek-Macedonian border near Idomeni

Stranded Iranian migrant Hamid, 34, an electrical engineer from the Iranian town of Sanandij sits on rail tucks in front of Macedonian riot police guarding the borderline between Greece and Macedonia near the Greek village of Idomeni November 23, 2015. Hamid and a dozen other Iranian migrants are on hunger-strike for a second day. Balkan countries have begun filtering the flow of migrants to Europe, granting passage to those fleeing conflict in the Middle East and Afghanistan but turning back others from Africa and Asia

Yannis Behrakis/Reuters

Stranded Iranian migrant Hamid, 34, an electrical engineer from the Iranian town of Sanandij sits on rail tucks in front of Macedonian riot police guarding the borderline between Greece and Macedonia near the Greek village of Idomeni on Monday

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

A migrant waits for transport to Slovenia after he registered at a new winter refugee camp in Slavonski Brod, Croatia, November 3, 2015. REUTERS/Antonio Bronic

Antonio Bronic/Reuters

A migrant waits for transport to Slovenia after he registered at a new winter refugee camp in Slavonski Brod, Croatia today.

A refugee hands over a toddler to a volunteer lifeguard as a half-sunken catamaran carrying around 150 refugees, most of them Syrians, arrives after crossing part of the Aegean sea from Turkey on the Greek island of Lesbos...A refugee hands over a toddler to a volunteer lifeguard as a half-sunken catamaran carrying around 150 refugees, most of them Syrians, arrives after crossing part of the Aegean sea from Turkey on the Greek island of Lesbos, October 30, 2015. There were no casaulties amongst the refugees who were travelling on the catamaran, according to a Reuters witness. The death toll from drownings at sea has mounted recently as weather in the Aegean has taken a turn for the worse, turning wind-whipped sea corridors into deadly passages for thousands of refugees crossing from Turkey to Greece.  REUTERS/Giorgos Moutafis

Giorgos Moutafis/Reuters

A refugee prepares to hand over a toddler to a volunteer lifeguard as a half-sunken catamaran carrying around 150 refugees, most of them Syrians, arrives after crossing part of the Aegean sea from Turkey on the Greek island of Lesbos. 

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

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

Refugees and migrants arrive on the shore of the Greek island of Lesbos after crossing the Aegean Sea from Turkey on Monday. UN Secretary-General Ban Ki-moon welcomed the European Union's decision to inject $1 billion to help countries overwhelmed by Syrian refugees, but said more must be done to relocate migrants

Aris Messinis/AFP

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

A child sits behind a fence as refugees and migrants wait for a train heading to Serbia near the Macedonian-Greek border on September 25, 2015. European Union leaders hold an emergency migration summit on September 23 amid a growing east-west split after ministers forced through a controversial deal to relocate 120,000 refugees.

Armend Nimania/AFP

A child sits behind a fence as refugees and migrants wait for a train heading to Serbia near the Macedonian-Greek border on Friday

Migrant children gesture

AFP/Getty Images

Migrant children gesture in a train heading to the Croatian-Hungarian border, at the train station of the east-Croatian town Tovarnik.

A migrant protests as Hungarian riot police fires tear gas and water cannon at the border crossing with Serbia in Roszke...A migrant protests as Hungarian riot police fires tear gas and water cannon at the border crossing with Serbia in Roszke, Hungary September 16, 2015. Hungarian police fired tear gas and water cannon at protesting migrants demanding they be allowed to enter from Serbia on Wednesday on the second day of a border crackdown

Stoyan Nenov/Reuters

A migrant protests as Hungarian riot police fires tear gas and water cannon at the border crossing with Serbia in Roszke, Hungary on Wednesday

Migrants Refuse To Leave Train Stopped By Police At Hungarian Station...BICSKE, HUNGARY - SEPTEMBER 04:  Migrants protest outside a train that they are refusing to leave for fear of being taken to a refugee camp from the train that has been held at Bicske station since yesterday on September 4, 2015 in Bicske, near Budapest, Hungary. According to the Hungarian authorities a record number of migrants from many parts of the Middle East, Africa and Asia are crossing the border from Serbia. Since the beginning of 2015 the number of migrants using the so-called Balkans route has exploded with migrants arriving in Greece from Turkey and then travelling on through Macedonia and Serbia before entering the EU via Hungary. The massive increase, said to be the largest migration of people since World War II, led Hungarian Prime Minister Victor Orban to order Hungary's army to build a steel and barbed wire security barrier along its entire border with Serbia, after more than 100,000 asylum seekers from a variety of countries and war zones entered the country so far this year.  (Photo by Matt Cardy/Getty Images)

Matt Cardy/Getty Images

Migrants protest outside a train that they are refusing to leave for fear of being taken to a refugee camp from the train which has been held at Bicske station since yesterday in Bicske, near Budapest, Hungary. According to the Hungarian authorities a record number of migrants from many parts of the Middle East, Africa and Asia are crossing the border from Serbia. Since the beginning of 2015 the number of migrants using the so-called Balkans route has exploded with migrants arriving in Greece from Turkey and then travelling on through Macedonia and Serbia before entering the EU via Hungary. The massive increase, said to be the largest migration of people since World War II, led Hungarian Prime Minister Victor Orban to order Hungary’s army to build a steel and barbed wire security barrier along its entire border with Serbia, after more than 100,000 asylum seekers from a variety of countries and war zones entered the country so far this year.

A young child waits in line at a migrant reception center in Brussels on Tuesday, Sept. 1, 2015. Hundreds of migrants are arriving every day in Belgium, some making perilous journeys through Europe

Virginia Mayo/AP

A young child waits in line at a migrant reception centre in Brussels on Tuesday. Hundreds of migrants are arriving every day in Belgium, some making perilous journeys through Europe

A Syrian migrant carries children as he walks along railway track to cross Serbian border with Hungary near the village of Horgos...A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos August 27, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army as record numbers of migrants, many of them Syrian refugees, passed through coils of razor-wire into Europe

Marko Djurica/Reuters

A Syrian migrant carries his children as he walks along a railway track to cross the Serbian border with Hungary near the village of Horgos on Thursday