A wide ranging article from The Economist, which has some odd references, such as the bulldozers and tunnelling in insurgent Mali and a very useful map of religious observance across northern Africa:http://www.economist.com/news/briefi...sm?frsc=dg%7Ca

It ends, IMO not very helpfully with:
Should radicalised and militant forms of Islam spread farther, current grounds for confidence will be undermined. Intelligence agencies already have a heavy presence in Nairobi, the Kenyan capital, to sniff out terror links with the east African diaspora in the West. The real threat, though, is to African countries themselves. In many, including resource-rich ones like Nigeria, religious cleavages are widening. Both action by jihadists and action against jihadists could exacerbate the dangers.