Facing the fourth foreign fighters wave. What drives Europeans to Syria, and to Islamic state? Insights from the Belgian case. Egmont Paper 81, March 2016

‘A bizarre phenomenon,’ Der Spiegel concluded, after trying to figure out why young people left Germany to become foreign fighters in Syria. The magazine painted a portrait of two thirty-somethings with similar backgrounds and the same hobby – martial arts. One became director of a martial arts school in Hamburg, the other became a terrorist poster boy in Syria.2