Sudan conflict: what led to this?

David Aaronovitch and guests discuss the latest events in Sudan. Fighting has been commonplace ever since Sudan gained independence but what's behind the latest violence?Guests:James Copnall - currently presenting Newsday on the BBC World Service and formerly the BBC's Sudan correspondentMohanad Hashim - Sudanese journalist working on Newshour on the BBC World ServiceDame Rosalind Marsden, associate fellow at the Chatham House International Affairs and former UK ambassador to SudanProfessor Alex De Waal, Executive Director of the World Peace Foundation and Research Programme Director with the Conflict Research Programme at LSEProduced by: Kirsteen Knight, Claire Bowes and Ben Carter Edited by: Penny Murphy Sound engineer: Rod Farquhar Production co-ordinator: Siobhan Reed and Sophie Hill