KHARTOUM (AFP) - Sudan's army killed a key rebel leader from the Darfur region on Sunday, state media reported, three days after anti-government forces said they had begun advancing on the capital. "The Sudanese army announce that they killed Khalil Ibrahim in fighting today in west Wadbanda, North Kordofan," said the official SUNA news agency. Ibrahim, 54, headed the Justice and Equality Movement, once the most heavily armed group in the Darfur region, although its recent strength remains unclear. JEM said it would issue a statement later on Sunday. Asked about the reported killing, a source close to the group said: "I'm pretty sure it's true... It was apparently in a fight with the SAF (Sudan Armed Forces)."