In this photo taken on Thursday, July 23, 2015 migrants wait to board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. The country has become a major transit route for thousands of Middle Eastern and African refugees and migrants who cross over from Greece and then continue into Serbia. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 children, migrants from Afghanistan, look through a window after boarding a train to Serbia with their parents, at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants look through a window of a train on their way to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants enter a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 a migrant washes her shoes as with others waiting to board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. At least 25 have been killed by trains since January as they walked on railway tracks. Many others are robbed by criminal gangs. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 a migrant enters a train through window at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants enter a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 Red Cross workers carry to the ambulance a migrant who has been seriously injured after he climbed atop of a tank wagon where he suffered an electric shock, at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 a girl, migrant from Afghanistan, tries to drink water near the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 a migrant girl looks through a window of a train departing to Serbia from the railway station of Gevgelija, southern Macedonia. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 a migrant enters a train through a window at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants from Middle East, Asia and Africa wait to board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants wave from a window of a train departing to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 Red Cross workers gives the first aid to a migrant who has been seriously injured after he climbed atop of a tank wagon where he suffered an electric shock, in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants enter a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

In this photo taken on Thursday, July 23, 2015 migrants from Middle East, Asia and Africa wait to board a train to Serbia at the railway station in the southern Macedonian town of Gevgelija. (Photo by Boris Grdanoski/AP Photo)

Afghan refugees eat fruit and vegetables distributed by a Greek charity in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. Scores of migrants, mostly from Afghanistan, live in an unofficial camp in the rundown park, as Greek authorities have failed to formulate a coherent policy on how to handle a massive wave of illegal immigration. Nearly 50,000 people have illegally entered the country this year, mostly Syrian refugees who risk the sea crossing from Turkey in dangerous, overcrowded boats. From Greece, most try to continue north through the Balkans to more affluent European countries such as Germany. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees wash at a tap in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees reach out for food distributed by the “Solidarity For All” charity in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees rest in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees reach out for food distributed by the “Solidarity For All” in the Pedion tou Areos park in central Athens, Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees cool down in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees reach out for food distributed by the “Solidarity For All” charity in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

An Afghan refugee prays in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)

Afghan refugees prepare to fit a shoe distributed by the “Solidarity For All” on a child's foot, in the Pedion tou Areos park in central Athens, on Friday, July 24, 2015. (Photo by Giannis Papanikos/AP Photo)