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A rebel vehicle is seen in flames after clashes with Sudanese government security forces in Khartoum in this image taken from Sudan TV on Sunday May 11, 2008. Hundreds of rebels from the war-ravaged Darfur area clashed with Sudanese security forces on the doorstep of the capital Khartoum Saturday in a dramatic widening of the five-year old conflict. It was the first foray by a rebel group once confined to Sudan's western Darfur region into the seat of the Sudanese government. (AP Photo/Sudan TV)