Subscribe to France 24 now: http://f24.my/youtubeEN FRANCE 24 live news stream: all the latest news 24/7 http://f24.my/YTliveEN Cameroon’s far north region, on the border with Nigeria, is facing a rise in suicide bombings blamed on Boko Haram extremists. To deal with the spate of attacks, Cameroonian authorities are digging a major defence mechanism: a trench that will stretch for some 100 kilometres along the border. The aim is simple: to keep the extremists out. Our correspondents report. A programme prepared by Patrick Lovett and Christopher Davis. http://www.france24.com/en/reportages Visit our website: http://www.france24.com Subscribe to our YouTube channel: http://f24.my/youtubeEN Like us on Facebook: / france24.english Follow us on Twitter: / france24_en