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“Dumb” Yet Deadly: Local Knowledge and Poor Tradecraft Among Islamist Militants in Britain and Spain

Islamist militants frequently lack a talent for tradecraft. In recent attacks in Britain and Spain, terrorists made numerous mistakes: receiving traffic citations while traveling in “enemy” territory, acting suspiciously when questioned by the police, and traveling together during missions. Militants’ preference toward suicide operations restricts their ability to acquire practical experience, particularly when they lose their lives during attacks. And their unyielding devotion to their cause blinds them to opportunities to improve their operations. This is good news for counterterrorism officials. Terrorists’ poor tradecraft provides alert law enforcers with critical leads they can use to identify their attackers, unravel their plots, and—sometimes—disrupt their operations before they cause additional harm.