KHARTOUM, May 11 (Reuters) - The last of the Darfur rebel forces fled Sudan's capital on Sunday after unprecedented battles in the Khartoum suburb of Omdurman, a government official and a security source said.

"All rebel forces have now left the capital," Mutrif Siddig, the under-secretary at Sudan's Foreign Ministry, told Reuters.

A security source from Umm Bedda, the furthest outlying reach of west Omdurman, said rebels had retreated to some 70 km (45 miles) outside the city. (Reporting by Opheera McDoom)

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