From the Engelsberg Ideas Archive. The organisation that emerged under the name ISIS is not simply a terrorist group. It is a hybrid organisation comprised of a proto-state, a millenarian cult capable of attracting recruits from far beyond its borders, a network of Salafi jihadist groups, an organised criminal ring and an insurgent army led by highly skilled former Baathist military and intelligence personnel. Read by Leighton Pugh.

Image: Islamic State of Iraq and the Levant fighters shown in propaganda photos released by the militants. Credit: Handout / Alamy Stock Photo