The landscape for Ivory Coast's upcoming presidential elections is shaken up following the shock announcement of the death of Prime Minister Amadou Gon Coulibaly, the chosen candidate of President Alassane Ouattara. Also, Human Rights Watch accuses Burkinabé soldiers of extrajudicial killings of 180 men. We speak to HRW's Corinne Dufka about what has been dubbed a "killing field". And we report from Tunisia, where the colour purple has a long history. A dye known as Tyrian purple was once 15 times more expensive than gold and is today produced by only a handful of people across the world.
