An aid agency working in Sudan has warned levels of hunger and malnutrition in Sudan after a year of civil war are much worse than previously thought. Médecins sans Frontières and other organisations say the breakdown of governance and infrastructure mean a famine is now almost inevitable. The United Nations has said Sudan could become "the world's worst hunger crisis". We speak to an UN official in Darfur.

Also in the programme: fears are intensifying that Iran may be about to retaliate against Israel for the destruction of its consulate in Damascus in Syria last week; Researchers studying a dramatic supernova explosion say they're puzzled at how such a small star could have emitted the brightest burst of light ever recorded.

(Picture: A Sudanese baby whose refugee family comes from Darfur, receives treatment, at the hospital set up by the NGO Doctors Without Borders in Chad. Credit: EPA-EFE/REX/Shutterstock)