By Andrew Heavens KHARTOUM, Sept 6 (Reuters) - Sudanese forces launched ground and air attacks on at least three rebel positions in North Darfur on Saturday, killing an unknown number of people, insurgent groups said. Leaders from three rebel groups said government troops, backed by helicopters, Antonov planes and militias riding horses and camels, attacked their bases in Disa and Birmaza, close to a key...
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