Migrants climb through the windows of a train bound for Serbia at the train station in Gevgelija, The Former Yugoslav Republic of Macedonia, 19 July 2015. Thousands of migrants who crossed Greece are on their way through Macedonia towards Serbia in order to access other European countries. Hungary in mid-July started to put up a fence on its border with Serbia, which makes the situation with the migrants in the transit countries even more complicated. The European countries on 20 July will discuss the quota of how many migrants each country should accept. (Photo by Georgi Licovski/EPA)

Migrants try to get onboard an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. The European Union failed to reach a deal to resolve a migration crisis in the Mediterranean, and instead set a deadline of July 20 to reach an agreement on how to redistribute 40,000 asylum seekers currently in Italy and Greece. (Photo by Ognen Teofilovski/Reuters)

A migrant child of a family from Aleppo, Syria, looks out a window of a train at Gevgelija train station in Macedonia, near the border with Greece, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get onboard an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get onboard an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

A migrant child runs at Gevgelija train station in Macedonia, near the border with Greece July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get onboard an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants walk towards the train station in Gevgelija July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get onboard an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

A migrant waits for her transit papers at Gevgelija train station in Macedonia, near the border with Greece, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get onboard an overloaded International train, from Thessaloniki to Budapest at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

A Syrian man carries his 42-day-old son as they wait for the train at Gevgelija train station in Macedonia, near the border with Greece, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Tourists take pictures of migrants pushing to enter an international train from Thessaloniki to Budapest at Gevgelija train station in Macedonia, near the border with Greece, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Migrants try to get water on an overloaded train at Gevgelija train station in Macedonia, near the border with Greece, on their transit route to Europe, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)

Passengers look at migrants pushing to enter an international train traveling from Thessaloniki to Budapest at Gevgelija train station in Macedonia, near the border with Greece, July 19, 2015. (Photo by Ognen Teofilovski/Reuters)