Greece has installed a 40km (25-mile) fence and surveillance system on its border with Turkey amid concern over a surge of migrants from Afghanistan.

"We cannot wait, passively, for the possible impact," Greece's Citizens' Protection Minister Michalis Chrisochoidis said on a visit to the region of Evros on Friday.

"Our borders will remain inviolable."

His comments came as Turkey called on European countries to take responsibility for Afghan migrants.

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