Officials and helpers carry a migrant woman at the train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A migrant covered in a blanket drinks water outside a tent at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Migrants sleep beside tents at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Police try to stop migrants pushing to enter a bus at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A migrant stands in front of a tent, as police watches behind a fence at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A migrant with a child looks at police as she waits to enter a bus at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Red Cross workers attend to a migrant at the train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A migrant sits beside tents at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A migrant laughs as he holds a baby beside police at the train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A migrant holds a baby beside police at the train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants wait to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A pram is left on the tracks after migrants boarded a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Police talks to migrants in the rain, waiting to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants pull a boy through a train window at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants pull a boy through a train window at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Police do body checks on migrants before they are allowed to board their bus at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Police helps a migrant with a walking stick to pass a police cordon at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Migrants wait at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A migrant gestures as he talks to poilice at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





Army vehicles drive along barbed wire at the Hungary-Croatia border near Sarok, Hungary, September 20, 2015. (Photo by Bernadett Szabo/Reuters)





A member of the Iraqi security forces shows his passport as he prepares to travel, at the international airport in Najaf, south of Baghdad, September 3, 2015. Some Iraqi soldiers are abandoning their posts and joining a wave of civilian migrants headed to Europe, raising new doubts about the cohesion of the country's Western-backed security forces in the fight against Islamic State militants. Picture taken September 3, 2015. (Photo by Alaa Al-Marjani/Reuters)





Migrants wait to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants wait to board a train while others climb through windows at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Police secure a part of a platform as migrants wait to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants with babies wait to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants react after boarding a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants eat as they wait to board a train at the station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants wait to cross the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A migrant washes his hair at the Croatia-Slovenia border crossing at Bregana, Croatia, September 20, 2015. (Photo by Laszlo Balogh/Reuters)





A police officer carries a child over a barrier at the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





A migrant carries a child at the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





A man sleeps on the street at the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





A migrant child stumbles over a man who sleeps on the street at the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





Migrants pass first aid blankets at the Austria-Hungaria border, walking towards Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





Austrian soldiers line up in front of migrants the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





Migrants sit on railway tracks at a train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





Migrants sit on railway tracks at a train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A migrant boy sits on railway tracks at a train station in Tovarnik, Croatia, September 20, 2015. (Photo by Antonio Bronic/Reuters)





A migrants eats soup at the Austria-Hungaria border in Nickelsdorf, Austria, September 20, 2015. (Photo by David W. Cerny/Reuters)





Soldiers build a barbed wire fence at the Hungary-Croatia border near Sarok, Hungary, September 20, 2015. (Photo by Bernadett Szabo/Reuters)





Soldiers build a barbed wire fence at the Hungary-Croatia border near Sarok, Hungary, September 20, 2015. (Photo by Bernadett Szabo/Reuters)





Hungarian soldiers carry razor wire as they work on a fence being built along the border with Croatia near the village of Sarok, Hungary, Monday, September 21, 2015. Hungary's prime minister Viktor Orban said that millions of migrants are “laying siege” to the borders of his country and of Europe, putting the continent in danger. (Photo by Petr David Josek/AP Photo)





Barbed wire is seen at the Hungary-Croatia border near Sarok, Hungary, September 20, 2015. (Photo by Bernadett Szabo/Reuters)





Migrants board a train at the railway station in Tovarnik, Croatia September 21, 2015. (Photo by Antonio Bronic/Reuters)





Migrants board a train as Croatian policemen line up at the railway station in Tovarnik, Croatia September 21, 2015. (Photo by Antonio Bronic/Reuters)





A migrant jumps through a train window at the railway station in Tovarnik, Croatia September 21, 2015. (Photo by Antonio Bronic/Reuters)





Volunteers clean up a train station in Tovarnik, Croatia September 21, 2015. (Photo by Antonio Bronic/Reuters)





Syrian migrants walk on a motorway to reach the Greek border after they left from the main bus terminal in Istanbul, Turkey, September 21, 2015. Hundreds of migrants attempt to walk from Istanbul to the western city of Edirne, on Turkey's Greek border. (Photo by Huseyin Aldemir/Reuters)





A fishing boat carrying migrants in the Mediterranean is seen from the commercial ship CS Caprice in this handout photograph taken October 22, 2014 and provided to Reuters, September 14, 2015. (Photo by Campbell Shipping/Reuters)





An Afghan refugee seeks shelter in a phone booth during a rain storm in Victoria Square, where hundreds of migrants and refugees sleep rough, in central Athens, Greece, September 21, 2015. Bitterly divided European heads of state will seek to find a credible response to the worst migration crisis affecting the continent since World War Two at Wednesday's emergency summit. (Photo by Paul Hanna/Reuters)





Migrant children play as others rest in a camp in Opatovac, Croatia September 21, 2015. (Photo by Antonio Bronic/Reuters)





A migrant child sleeps at the surrounding area of the Sarayici oil wrestling arena in Edirne, Turkey, September 21, 2015. Bitterly-divided European leaders will seek to find a credible response to the continent's worst migration crisis since World War Two at an emergency summit this week. (Photo by Alexandros Avramidis/Reuters)





Migrants sleep at the surrounding area of the Sarayici oil wrestling arena in Edirne, Turkey, September 21, 2015. (Photo by Alexandros Avramidis/Reuters)





A migrant smokes a cigarette after waking up as others sleep at the surrounding area of the Sarayici oil wrestling arena in Edirne, Turkey, September 21, 2015. (Photo by Alexandros Avramidis/Reuters)





Migrants sleep at the surrounding area of the Sarayici oil wrestling arena in Edirne, Turkey, September 21, 2015. (Photo by Alexandros Avramidis/Reuters)





A volunteer signals at a dinghy with Afghan migrants at a beach on the Greek island of Lesbos, after the dinghy crossed a part of the Aegean Sea from the Turkish coast September 21, 2015. (Photo by Yannis Behrakis/Reuters)





Migrants walk as they cross the border from Serbia near Tovarnik, Croatia September 21, 2015. Croatia will demand that Greece stop moving migrants from the Middle East on to the rest of Europe, Interior Minister Ranko Ostojic said on Monday. (Photo by Antonio Bronic/Reuters)





A policeman gives written instructions to migrants as they cross the border from Slovenia to Bad Radkersburg, Austria September 21, 2015. (Photo by Leonhard Foeger/Reuters)





An abandoned doll lies on a rail track strewn with rubbish at the train station in Tovarnik, Croatia September 21, 2015. Croatia will demand that Greece stop moving migrants from the Middle East on to the rest of Europe, Interior Minister Ranko Ostojic said on Monday. Around 29,000 people, mostly from Syria, have arrived in Croatia from Serbia in the past week after trekking northwards through the Balkans from Greece en route to wealthier country in the west and north of the European Union. Croatia is a member of the EU but not part of its Schengen zone of borderless travel. (Photo by Antonio Bronic/Reuters)





A migrant walks past a police officer as she makes her way to board a train at the railway station in Tovarnik, Croatia September 21, 2015. Croatia will demand that Greece stop moving migrants from the Middle East on to the rest of Europe, Interior Minister Ranko Ostojic said on Monday. (Photo by Marko Djurica/Reuters)





Abeer, 26, a Syrian migrant from Deir al-Zor, uses her mobile phone while her daughters Yasmine, 6 (R), and Hanine, 3, jokes with their father Ihab as they travel from Hamburg to Lubeck, Germany, in this September 18, 2015 file picture. Ihab steps off the train at Luebeck station and, seeing his family on the platform, breaks into a run. Ihab's parents and other family members found sanctuary in Luebeck some time ago, but have always longed for Ihab to join them. (Photo by Zohra Bensemra/Reuters)