The UN calls it ‘the world’s worst humanitarian crisis’. But what is causing the violence in Darfur, and why hasn’t the world acted to stop it? Jess Worth goes in search of answers. An estimated 400,000 Darfurians have been killed. Three million – half the population – have been displaced.

Humanitarian agencies have limited access and are barely able to operate, the region is so dangerous. Now the conflict is escalating, spilling over into Chad and Central African Republic, displacing tens of thousands more and threatening to destabilize the entire region. The rest of the world has largely stood aside and watched.

http://www.newint.org/features/2007/06/01/keynote/