Aid groups : Peace deal signed in 2005 ` ` on the brink of collapse '' Aid groups : About 2,500 people killed , 350,000 fled in southern Sudan last year . U.N. : More people died in southern Sudan in 2005 than in Darfur . Report : Protecting civilians should be core priority for UN missions .
Aid groups : Peace deal signed in 2005 `` on the brink of collapse '' Aid groups : About 2,500 people killed , 350,000 fled in southern Sudan last year . U.N. : More people killed in southern Sudan in 2009 than in Darfur . Report : Protecting civilians should be core priority for U.N. peacekeepers .