NEA VISSA, GREECE - This little farming town on the edge of Europe, where the crosses of Greek Orthodox churches face Turkey's minarets scarcely a mile away, has become the latest battleground in the continent's war against a flood of unwanted immigrants from the strife-torn Muslim world.

The European Union's joint border patrol force, Frontex, dispatched armed international guards last week to reinforce Greek patrols around Nea Vissa, seeking to seal an eight-mile stretch of frontier that has become the main corridor for illegal entry into Europe for thousands of fortune-seeking Afghans, Iraqis, Iranians, Pakistanis and North Africans. The 200-member pan-European deployment marked the first such Frontex operation along the borders of one of the European Union's 27 member nations. Greek officials called it a belated recognition that the onrush of immigrants here is a problem that must be dealt with by all of Europe.

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