Kenya vows those responsible will be "held accountable" after a truck full of gas cylinders exploded in Nairobi, killing at least three people and injuring 280. In Tunisia, Rached Ghannouchi is sentenced to a further three years in prison. The head of the main Ennahdha opposition party is convicted for receiving foreign financing. And ahead of World Cancer Day on February 4, we head to Senegal, where some treatments are given for free while civil society helps raise awareness of the disease.