Senegal: What's driving migrants to leave?

As European governments harden their stance on undocumented migration - we hear what's been happening to hundreds of people found in the Mediterranean by Spanish authorities. And what drives people to make these dangerous journeys.<br /> <br /> Migrants from sub-Saharan Africa have been attacked in the Tunisian city of Sfax, with dozens reportedly wounded. We hear from one of them. <br /> <br /> And a plan from the African Union to tap into the youthful energy that abounds on the continent.