French soldiers in Mali on patrol at Gao's port, near the Niger river, on Thursday. The UN expressed concern over reprisal attacks against ethnic Tuaregs and Arabs in Mali, where a French-led intervention recently routed Islamist rebels. Photograph: Joel Saget/AFP/Getty Images

Behind the ornate door of what was once a chi-chi French-owned hotel lies a series of rooms which, for most of last year, comprised the Islamic(...)