A Sudanese tank sits in position in Khartoum's twin city of Omdurman, the scene of a rebel assault Saturday night, in Sudan Sunday, May 11, 2008. Sudan severed relations with Chad on Sunday, accusing it of supporting fighters who assaulted the capital the night before, and warned that a top Darfur rebel leader was hiding somewhere in the city. (AP Photo/Abd Raouf)

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