In this  April 21, 2017 photo women with head scarfs are walking in a pedestrian zone in Vienna, Austria.  An Austrian law banning dual-nationality in most cases and requiring new citizens to give up their old passports upon naturalization applies to all nationalities. But as Austrian-Turkish tensions grow, Turks appear to be increasingly targeted. While previous double-passport holders were discovered only by chance, politicians pushing the issue now are calling for organized efforts to identify them. (AP Photo/Ronald Zak,file)
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