In 2003, peace negotiations between North and South Sudan were taking place.
Another crisis developed in the Western province of Darfur.
Long term drought had led to tensions between Arab nomadic herders and the African farming communities.
(violent conflict)
Darfur accused the Sudanese government of neglecting the violent conflict which had broken out there.
Fighting broke out between Darfur rebel groups and Sudanese government forces - allied with Janjaweed militia.
After air attacks on civilian settlements by Sudanese government forces, the Janjaweed militia would often ride in on horseback, killing the men and murdering, kidnapping and raping women + children.
Hundreds of thousands were killed and many more became refugees.
The scale of atrocities led to events in Darfur being categorised as ethnic cleansing.