A policeman is killed in a siege on the outskirts of Tunis, which security forces suspect has been used as a base for islamist extremists. This just three days before crucial parliamentary elections. The African Union announces it is ramping up efforts to help countries at the heart of West Africa's Ebola epidemic by sending in hundreds of medical staff. And Botswana's also readying itself for a crunch vote as the ruling party face its toughest yet challenge in presidential elections.
