Senegal makes U-turn to back ex-president Sall for UN chief

Summary

In tonight's edition, a deadly ambush in northern Mali leaves at least 50 soldiers dead. Also, Nigeria is facing a new challenge in its fight against jihadist insurgents as foreign fighters join armed groups. And Senegalese President Bassirou Diomaye Faye is backing former president Macky Sall's bid to become UN Secretary-General.