In Britain alone, several thousand young Muslims are thought to be part of violent extremist networks. How did they become involved? What are the mechanisms and dynamics through which European Muslims join al-Qaeda and groups inspired by al-Qaeda? This paper explains the processes whereby European Muslims are recruited into the Islamist militant movement. It reveals that although overt recruitment has been driven underground, prisons and other 'places of vulnerability' are increasingly important alternatives. It explores the recruitment roles of radical imams, gateway organisations and...