UN warns of escalating conflict and humanitarian crisis in Sudan.

The UN's top aid official, Martin Griffiths, has warned that Sudan's descent into violence is at a dangerous tipping point, with the "will to end the fight still not there" after speaking to Sudan's rival military leaders. He called for security guarantees from the warring sides to allow humanitarian aid into the country, warning that the fighting could force hundreds of thousands of Sudanese to flee their homes. The UN is warning of a possible exodus of 800,000 with others warning that number could be in the millions.