Since February 2003, Sudan's western province of Darfur has been the site of an extremely violent conflict between the province's nomadic Arab tribes, supported by the government in Khartoum, and the native African settled peasant tribes. The present conflict started in February 2003 and has rapidly developed into one of the most violent military confrontations on the continent. There have been an estimated 30,000 casualties, one million people are displaced within the province and over 120,000 have fled into neighbouring Chad.