Which area's open border policy was an obstacle in capturing the perpetrators of the bombing of an open-air café in Paris in 2015?

Name: Which area's open border policy was an obstacle in capturing the perpetrators of the bombing of an open-air café in Paris in 2015?
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Question

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The European Union's Schengen Area allows for open borders between member countries, which can complicate efforts to track and capture suspects who can move freely across borders.

Which Area's Open Border Policy Was an Obstacle in Capturing