The latest conflict has plunged Sudan into "one of the worst humanitarian nightmares in recent history", according to the UN who also warn it may trigger the world's largest hunger crisis. UNICEF says some communities in Sudan have been pushed to the brink of famine.

We speak to Mark Townsend, a senior global development reporter at the Guardian who has recently visited neighbouring Chad, home to Sudanese refugees. He talks about evidence of ethnic cleansing, in "Darfur's unfolding dystopian nightmare".

We also speak to the Co-Directors at Waging Peace, an NGO based in the UK dedicated to building better lives for Sudanese refugees.