Migrants from many parts of the Middle East and African nations continue to flood into Europe, bringing Europe’s asylum system to breaking point. Since the beginning of 2015 the number of migrants using the so-called “Balkans route” has exploded, with migrants arriving in Greece from Turkey and then traveling through Macedonia and Serbia before entering the EU via Hungary. The number of people leaving their homes in war-torn countries such as Syria and Iraq marks the largest migration of people since World War II. The International Organization for Migration says that more than 350,000 migrants have been detected at Europe’s borders in 2015. Above, migrants walk down a street in Budapest, Hungary, Sept. 5 after leaving Budapest’s railway station on foot, planning to walk to Vienna. The day before, another 1,000 migrants set off on a similar journey. Hungary sent about 4,500 migrants to the Austrian border by bus overnight, including those who were walking on the highway, but said this was a one-off and there would be no further transports.

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Migrants and refugees wait for a registration procedure after crossing the Macedonian-Greek border near Gevgelija, Macedonia, Sept. 4.

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Migrant families arrive in an inflatable dinghy on the beach at sunrise in Kos, Greece. The International Organization for Migration estimates that more than 5,000 migrants and refugees a day have crossed the Aegean Sea into Greece.

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Migrants from Pakistan land on shore in Kos, Greece, after completing a journey in a small raft crossing a three-mile stretch of the Aegean Sea from Turkey. The IOM estimates that more than 2,600 people have drowned this year in the Mediterranean trying to reach Greece. An image of a toddler, three-year-old Aylan Kurdi, whose drowned body was found on a beach in Turkey, has called international attention to the crisis. The bodies of 71 people believed to be Syrian migrants were found in an abandoned truck in Austria Aug. 27.

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A relative mourns over the body of three-year-old Aylan Kurdi, one of the two Syrian toddlers who drowned with their mother as they were trying to reach Greece. Abdullah Kurdi, their father, wept as their bodies were buried alongside each other in the “Martyrs’ Ceremony” in the predominantly Kurdish town of Kobani, Syria, near the border with Turkey.

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Migrants wait to board a ferry from the island of Kos for transport to the Greek mainland port of Piraeus Aug. 31. From Piraeus, many migrants continue north to the Greek border crossing at the town of Idomeni where they will cross over into Macedonia.

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Riot police stand guard in front of a migrant reception center in Roszke, Hungary, Sept. 4. Some 300 migrants broke out of a Hungarian border camp and hundreds of others set off on foot from Budapest as police scrambled to keep control of a migrant crisis. Police said they had given chase and halted traffic on a nearby motorway after the migrants broke out of the Roszke reception center on Hungary’s southern border with Serbia.

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A migrant from Pakistan watches the setting sun in the former lobby of the abandoned Captain Elias Hotel Aug. 29, in Kos. The abandoned hotel has been taken over by recently arrived migrants from many different nations who have nowhere else to stay and few resources for shelter.

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Syrian migrants join thousands waiting for travel documents to be issued at a Serbian processing facility Sept. 4 in Preshevo, Serbia. After stopping at the Serbian processing facility, where the wait can last for three days, many of the migrants will continue north by bus to attempt to enter Hungary.

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Some of approximately 190 migrants who arrived on a train from Budapest and were detained by German police wait to be initially registered by the police at the railway station on Aug. 31 in Rosenheim, Germany. Police said the train was carrying approximately twice that number of migrants lacking passports or visas and that the rest would be detained upon the train’s arrival in Munich. German police monitor trains arriving from the Balkans and from Italy that go through Rosenheim and currently detain around 350 people a day for traveling without a passport. The police register the migrants, mostly from countries including Syria, Afghanistan and Eritrea, fingerprint them and check whether any are already in the European asylum-applicants or criminal databases. From there the migrants are free to travel within Germany to reception centers where they can apply for asylum. Up to 1,600 migrants are currently arriving in Bavaria in southern Germany a day and will seek asylum. Germany is expecting to receive 800,000 asylum-seeking migrants this year and is struggling to cope with the record number.

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Migrants wait after their arrival from Hungary at the main train station in Munich, Germany, Sept. 1.

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Volunteers hand over food to migrants who had arrived at Munich’s main railway station on Sept. 1. Migrants who marched from Hungary to the Austrian border were offered food, water and supplies along the route by Hungarian volunteers.