00:00The Schengen area, Europe's passport-free zone binding together 420 million Europeans, is now under threat.
00:09Once a pillar of European integration, its future is increasingly uncertain.
00:15Last week, Germany announced it would reintroduce border controls with all nine of its neighbours,
00:20citing a surge in irregular migration and recent extremist attacks.
00:26Hungary quickly followed suit, tightening its borders to stem the flow of migrants.
00:33The fallout has been immediate. Poland called Germany's move unacceptable,
00:38while Austria refused to accept migrants turned back at the border.
00:44With Slovenia and Italy also ramping up controls, Schengen's future as a seamless travel zone is now on shaky ground.
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