A young migrant woman carries a baby before departing a transit zone on a public bus to the Hungarian border village Hegyeshalom early in the morning in Budapest on September 5, 2015. The first buses carrying migrants who have been stranded in the Hungarian capital set off for Austria and Germany early after they agreed to receive thousands of refugees desperate to start new lives in Western Europe. AFP PHOTO/ ATTILA KISBENEDEK (Photo credit should read ATTILA KISBENEDEK/AFP/Getty Images)

FILE - In this Sept. 3, 2015 file photo, a woman lies on the track with a baby as she is detained in Bicske, Hungary. Over 150,000 migrants have reached Hungary this year, most coming through the southern border with Serbia. Many apply for asylum but quickly try to leave for richer European Union countries. (AP Photo/Petr David Josek, File)

A man gestures as buses drive with migrants from a transit zone to the Hungarian border village Hegyeshalom early in the morning in Budapest on September 5, 2015. The first buses carrying migrants who have been stranded in the Hungarian capital set off for Austria and Germany early after they agreed to receive thousands of refugees desperate to start new lives in Western Europe. AFP PHOTO/ ATTILA KISBENEDEK (Photo credit should read ATTILA KISBENEDEK/AFP/Getty Images)

FILE - In this Sept. 4, 2015 file photo, a woman looks out of a train that has stopped in Bicske, Hungary. Over 150,000 migrants have reached Hungary this year, most coming through the southern border with Serbia. Many apply for asylum but quickly try to leave for richer EU countries. (AP Photo/Petr David Josek, File)

A father carries his kids as local buses drive away in convoy with migrants from a transit zone to the Hungarian border village Hegyeshalom early in the morning in Budapest on September 5, 2015. The first buses carrying migrants who have been stranded in the Hungarian capital set off for Austria and Germany early after they agreed to receive thousands of refugees desperate to start new lives in Western Europe. AFP PHOTO/ ATTILA KISBENEDEK (Photo credit should read ATTILA KISBENEDEK/AFP/Getty Images)

A woman and her children sit as they have boarded a bus provided by Hungarian authorities for migrants and refugees at Keleti train station in Budapest, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary\'s government as Austria in the early-morning hours said it and Germany would let them in. Austrian Chancellor Werner Faymann announced the decision early Saturday after speaking with Angela Merkel, his German counterpart - not long after Hungary\'s surprise nighttime move to provide buses for the weary travelers from Syria, Iraq and Afghanistan. (AP Photo/Marko Drobnjakovic)

A man holds a child as they stand on the door of a bus provided by Hungarian authorities for migrants and refugees at Keleti train station in Budapest, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary\'s government as Austria in the early-morning hours said it and Germany would let them in. Austrian Chancellor Werner Faymann announced the decision early Saturday after speaking with Angela Merkel, his German counterpart - not long after Hungary\'s surprise nighttime move to provide buses for the weary travelers from Syria, Iraq and Afghanistan. (AP Photo/Marko Drobnjakovic)

A man laughs as he sits inside a bus provided by Hungarian authorities for migrants and refugees at Keleti train station in Budapest, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary\'s government as Austria in the early-morning hours said it and Germany would let them in. Austrian Chancellor Werner Faymann announced the decision early Saturday after speaking with Angela Merkel, his German counterpart - not long after Hungary\'s surprise nighttime move to provide buses for the weary travelers from Syria, Iraq and Afghanistan. (AP Photo/Marko Drobnjakovic)

A man runs with child in arms as he tries to board a bus provided by Hungarian authorities for migrants and refugees at Keleti train station in Budapest, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary\'s government as Austria in the early-morning hours said it and Germany would let them in. Austrian Chancellor Werner Faymann announced the decision early Saturday after speaking with Angela Merkel, his German counterpart - not long after Hungary\'s surprise nighttime move to provide buses for the weary travelers from Syria, Iraq and Afghanistan. (AP Photo/Marko Drobnjakovic)

BUDAPEST, HUNGARY - SEPTEMBER 05: Migrants board buses said to be bound for Austria outside Keleti station in central Budapest on September 4, 2015 in Budapest, Hungary. Earlier today thousands of migrants began marching towards Austria however the Hungarian government has decided to lay on buses for them and migrants currently in the capital city. (Photo by Matt Cardy/Getty Images)

Migrants sit in a bus from Budapest to the Austrian border near Gyor, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary\'s government as Austria in the early-morning hours said it and Germany would let them in. (AP Photo/Balint Szlanko)

BUDAPEST, HUNGARY - SEPTEMBER 05: Migrants prepare to board buses said to be bound for Austria outside Keleti station in central Budapest on September 4, 2015 in Budapest, Hungary. Earlier today thousands of migrants began marching towards Austria however the Hungarian government has decided to lay on buses for them and migrants currently in the capital city. (Photo by Matt Cardy/Getty Images)