The number of refugees seeking asylum in Germany could surge to 750,000 this year, according to reports citing official projections.
The government in Berlin had earlier forecast that 450,000 asylum seekers could arrive in 2015, but is now set to increase that to 650,000 or higher.
Germany has seen a wave of migration from Syria and the Balkans.
UN High Commissioner for Refugees Antonio Guterres said more countries in Europe should share the burden.
“It is unsustainable in the long run that only two EU countries, Germany and Sweden, take in the majority of refugees,” he told German daily Die Welt.
Up to 80,000 people, many of them Syrians, are expected to seek asylum in Sweden this year, but Germany has become the most popular destination.
More than 240,000 migrants have crossed the Mediterranean already this year, arriving on the shores of Greece and Italy before travelling on to other destinations.
In the past week alone, 21,000 migrants have arrived in Greece, according to the United Nations.
OVER 5,000 NIGERIAN MEN HAVE OVERCOME POOR BEDROOM PERFORMANCE SYNDROME DUE TO THIS BRILLIANT DISCOVERY