ATHENS - Thousands of refugees and migrants arrived in Athens on Wednesday, piling further pressure on increasingly divided European nations as they struggle to cope with the unprecedented influx.
Fresh protests also erupted in Hungary, a key transit point for the huge numbers of people trekking up from Greece through the Balkans in search of a new life in northern Europe. Greece, on the frontline of the continent's biggest migration crisis since World War II, appealed for an "immediate" response from the EU and urged the UN to become involved.
Two government-chartered ships carrying some 4,300 people, many of them refugees from war-torn Syria, docked at Athens' Piraeus port after sailing from Lesbos, one of several Greek islands inundated by thousands of people crossing from Turkey in flimsy boats.
In Hungary - a country that saw 50,000 migrants enter in August alone - police blocked some 2,000 people from boarding trains from Budapest to Austria and Germany, triggering angry demonstrations at the main international railway station.
Another group staged a sit-in at a suburban station, refusing to board a train to a Hungarian refugee camp and demanding they be allowed to travel on to Germany, which as the EU's top economy is destination of choice for many.
"Normal people, abnormal people, educated, uneducated, doctors, engineers, any people, we're staying here. Until we go by train to Germany," said Mohammad, a Syrian protesting at the station. "It's not our dream to stay here and to sleep in the streets."
More than 350,000 people have made the perilous journey across the Mediterranean this year, according to the International Organization for Migration, stoking friction in the 28-member EU over how to share the burden fairly.
Officials and analysts say the crisis is increasingly placing the continent's cherished system of borderless travel at risk, with German Chancellor Angela Merkel warning that the passport-free Schengen zone will be at risk if the EU cannot agree a common asylum policy.
Police said migrants were arriving in Germany at a rate of 100 an hour early Wednesday, most of them pulling into the Bavarian capital Munich by train from Hungary via Austria. Hungary allowed thousands to board the trains earlier this week, but in a U-turn on Tuesday police suddenly blocked access to the main station in Budapest for anyone without an EU visa. The government said it was simply applying EU rules.
In France, Eurostar trains ground to a halt in the early hours of Wednesday as several people - believed to be migrants - climbed onto the tracks near the port of Calais, leaving hundreds of passengers stranded overnight in the dark and in stifling heat. Several trains on their way to London or Paris had to turn back, and two trains were cancelled to deal with the backlog of passengers. Some 3,000 migrants are living in makeshift camps near the port and have ramped up their attempts to cross through the Channel Tunnel to England in recent months, with at least nine people killed.