Darfur rebels advance on Sudan capital, their leader says

• Story Highlights
• Rebel leader says hundreds of fighters have reached city adjoining Sudanese capital
  
• Sudan military says its forces are "confronting" rebels in city of Omdurman
  
• Curfew in place in capital, Khartoum; bridges cut between Khartoum and Omdurman
  
• Sudan accuses neighboring Chad of backing the Darfur rebels
  
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