Photo Senegalese commandos during a recent United States-led training exercise in Senegal. Credit Sergey Ponomarev for The New York Times THIES, Senegal — The Islamic State’s branch in Libya is deepening its reach across a wide area of Africa, attracting new recruits from countries like Senegal that had been largely immune to the jihadist propaganda — and forcing the African authorities and their Western allies to increase efforts to combat the fast-moving threat. The American airstrikes in northwestern Libya on Friday, which demolished an Islamic State training camp and were aimed at a top Tunisian operative, underscore the problem, Western officials said. The more than three dozen suspected Islamic State fighters killed in the bombing were recruited from Tunisia and other African countries, officials said, and were believed to be rehearsing an attack against Western targets. Even as American intelligence agencies say the number of Islamic State fighters in […]