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. View Full Article: http://www.washingtonpost.com/world/europe/getting-a-gun-legally-in-europe-may-be-hard-but-terrorists-have-little-trouble/2015/02/19/9eb6bce2-b78b-11e4-bc30-a4e75503948a_story.html?tid=sm_tw