Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Migrants walk along a railroad connecting Hungary and Serbia as they cross into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Migrants take a rest at a refugee camp near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Hungarian soldiers and workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi)

Sun rises behind a razor-wire fence on the Hungarian border with Serbia, which is intended to prevent illegal crossings into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 10

A police vehicle stays next to a razor-wire fence on the Hungarian border with Serbia, which is intended to prevent illegal crossings into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 11

Hungarian workers install razor-wire to a fence on the border with Serbia, which is intended to prevent illegal crossings into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 12

Migrants walk along a railroad connecting Hungary and Serbia as they cross into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 13

Migrants walk along a railroad connecting Hungary and Serbia as they cross into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 14

Migrants walk along a railroad connecting Hungary and Serbia as they cross into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 15

Migrants take a rest after crossing into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 16

Migrants walk along a railroad connecting Hungary and Serbia as they cross into Hungary, near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 17

Migrants take a rest at a refugee camp near Roszke, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 19

Migrants take a rest after crossing into Hungary, near Asotthalom, southern Hungary, on Aug. 30, 2015. Over 140,000 refugees have entered Hungary since the start of the year. (Xinhua/Attila Volgyi) 20