Urban violence has reached unprecedented levels in many cities around the world, destabilizing whole societies and making life miserable for its victims. It is a trend we are looking at in detail in the upcoming World Development Report  which looks at conflict, violence and development.
To get a better understanding of the complicated inter-play between poverty, gangs, and bare-knuckled politics, I visited Nairobi's Mathare slum which is home to 850,000 people. Julius, who runs the Julius Mwelu Foundation , showed me around. I took a small video camera with me and this is my report: