Boko Haram threat forces detour for Cameroon merchants People transporting goods to and from the city of Maroua in Cameroon and N’Djamena are increasingly using alternative routes to avoid the risk of attack by Boko Haram on the main highway. People living close to a river crossing between Chad and Cameroon now frequented by traders, fear an infiltration of Boko Haram militants. IMAGES AND SOUNDBITES. REFILE to make corrections to dopesheet and add text story.