The United Nations said on Friday it could see no easing of the flow of refugees into Europe, with 8,000 arrivals daily, and that problems now facing governments may turn out to be only "the tip of the iceberg".

Hungary, which lies in the path of the largest migration wave Europe has seen since World War Two, said it was seeking support to halt an influx from Croatia after sealing its border with Serbia by building a 3.5-metre-high steel fence.

Amin Awad, regional refugee coordinator for the U.N. refugee agency UNHCR, told journalists in Geneva the body's past warnings on the scale of the problem had not been taken seriously.

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