http://www.bbc.com/news/magazine-29761018 http://www.bbc.com/news/magazine-29761018 BBC http://www.bbc.com/n...gazine-29761018 http://www.bbc.com/n...gazine-29761018 appeal of a caliphate http://www.bbc.com/news/magazine-29761018 http://www.bbc.com/news/magazine-29761018 bbc.com