Hundreds of thousands of migrants -- most of them refugees fleeing conflict and violence in places like Syria, Afghanistan and Iraq -- have crossed the Mediterranean into Europe this year and travelled up from Greece through the Balkans, aiming to start new lives in more prosperous northern European countries.
Alarmed by the influx, officials in Balkan countries at the heart of the migrant route said this week they were restricting the crossings of economic migrants and allowing in only those fleeing conflict.
"This is becoming increasingly untenable..., not least in light of falling temperatures and the risk for children and others with specific needs," they said.
UNHCR spokesman Adrian Edwards pointed out to reporters that the restrictions were "creating tension at border crossing as a domino effect, leaving in total limbo some refugees and migrants stranded at different border points."
"And that, as we head into winter is a serious, serious worry," he said.
IOM spokesman Joel Millman told reporters there were concerns that the numerous restrictions would push migrants to travel through Bulgaria and Albania where conditions are "much more onerous."
UNICEF spokeswoman Sarah Crowe meanwhile stressed that children, who account for a growing percentage of the migrants, are particularly at risk from the plunging temperatures.
"Especially small babies, children with disabilities all are under heightened risk," she told reporters, adding that the "very large numbers of unaccompanied children" arriving in some countries were vulnerable.
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