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Jarmes R. Clapper

Refugee surge to Europe raises concern about militants

When Islamic State extremists lost control of a key crossroads town in northern Syria in June, some militants shed their jihadi garb and blended in with the flood of Syrians fleeing across the Turkish border. Since then, the exodus of Syrians and Iraqis toward Europe has surged — and Europeans opposed to taking in more refugees say that more than ever, they fear "disguised terrorists" in their midst.

Governments along the route have different assessments of the threat. Two senior Iraqi officials and a Syrian activist say a small group of hardened Islamic State extremists is believed to have left the war zones of Iraq and Syria to blend in with the masses of asylum...