Darfur is a region of western Sudan. Dār is an Arabic word meaning "home [of]" – the region was named Dardaju while ruled by the Daju, who migrated from Meroë c. 350 AD, and it was renamed Dartunjur when the Tunjur ruled the area. From Wikipedia
The attack on Obeid prison, which also injured 50 detainees, highlights the intensifying civil war and growing civilian toll in Sudan.