Can the flow of arms into conflict-hit Sudan be stopped?

The international watchdog, Amnesty International, is calling for a nationwide arms embargo on Sudan after its investigation found that a constant flow of weapons is fuelling the devastating war. But how can the supply of arms be stopped?For the first time, sub Saharan Africa has seen a dramatic drop in new HIV infections compared to the rest of the world, so what is driving that success?And we hear from Gofa in southern Ethiopia, where there are fears that the death toll will continue to rise following the deadly landslides.Presenter: Charles Gitonga Producers: Sunita Nahar and Yvette Twagiramariya in London; Frenny Jowi in Nairobi Technical Producer: Nick Randell Senior Producer: Patricia Whitehorne Editors: Andre Lombard and Alice Muthengi