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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
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.
The terrorist threat against Europe has mutated in the last half-decade as jihadist groups have seen their Middle East sanctuaries eroded, but analysts say the West must remain braced for more attacks
The imminent fall of the Islamic State's caliphate in Iraq and Syria has left many countries grappling with what to do with jihadists who want to return.
Jihadists claiming allegiance to Al-Qaeda or the Islamic State group have struck in several European countries, with France. Here is a recap of major attacks in Europe over the past three years.
Already wrestling with a constantly-evolving terror threat, European intelligence agencies spy a new problem on the horizon: hundreds of jihadists due to be released from prison.