Europe, a continent long known for the rarity of gun violence, is confronting twin challenges that give the issue sudden urgency: a growing population of radicalized young men determined to strike targets close to home, and a black market awash in high-powered weapons. If you want an illicit assault rifle, such as the one used by a 22-year-old to rake a Copenhagen cafe with 28 bullets on Saturday, all it takes are a few connections and some cash.
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