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The fallout from November's shootings in Vienna has shone a light on Europe's dilemma in dealing with jihadists, particularly the continent's struggles to deradicalise individuals
European leaders have mooted tightening the EU's external borders, as they vowed joint action following a spate of attacks on home soil blamed on Islamist radicals
A shooting rampage by an Islamic State supporter in Vienna that killed four people is the latest in a spate of such atrocities in Europe. A recap of the deadliest attacks since 2015.