Dado Ruvic / Reuters A man types on a keyboard in front of a computer screen on which an Islamic State flag is displayed, in this picture illustration taken in Zenica, Bosnia and Herzegovina, February 6, 2016.
Foreign Affairs From The Anthology: Europe's Furies
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The Myth of Lone-Wolf Terrorism

The Attacks in Europe and Digital Extremism

This month, Europe has again been rocked by a series of shocking terrorist attacks perpetrated by lone individuals and claimed in the name of the Islamic State (ISIS). On July 14, Mohamed Lahouaiej Bouhlel, a Tunisian national residing in France, killed over 80 and wounded hundreds when he ploughed a 19-ton cargo truck through crowds celebrating Bastille Day in the southern French city of Nice. Mere days after the Nice massacre, a 17-year-old Afghan migrant seeking asylum in Germany attacked passengers on a train in Würzburg with an axe and a knife, wounding four before police killed him. Two other attacks claimed in ISIS’ name have been carried out since then: A suicide bombing on July 24 injured 15 in the German city of Ansbach, and on July 26, two attackers claiming allegiance to ISIS stormed a church in a suburb of the French city of Rouen, slit an 84-year-old priest’s throat, and took hostages.

These incidents are part of a broader trend of increasing violence carried out by lone individuals. Analysts, journalists, and scholars have been quick to label each perpetrator of recent attacks as a lone wolf: individuals who lacked substantial connections to ISIS or other jihadist groups and who carried out their operations without the assistance of others. The designation has generally been applied within 24 hours of these attacks, before significant intelligence about an incident’s planning and execution has emerged—and long before authorities have concluded their investigation. Indeed, less than a day after the Nice attack, observers rushed to describe Lahouaiej Bouhlel as a lone wolf who was not in fact linked to ISIS.

Observers have repeatedly erred by definitively categorizing attacks as lone-wolf operations when they would later turn out to be connected to broader cells or networks. At a minimum, individuals labeled lone wolves are often in communication with other militants, sometimes using encrypted services that are difficult to detect and decipher. There is a danger in rushing to label operatives as disconnected from others, as doing

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