In this Thursday, Feb. 15, 2007 file photo, Khalil Ibrahim, the head of one of Darfur's main rebel groups, the Justice and Equality Movement (JEM), is seen during an interview in the town of Abeche in eastern Chad. In a telephone interview with the Associated Press, Khalil Ibrahim vowed to keep up his group's offensive against Sudan's government, saying he can "exhaust" its military by forcing it to spread thin around the vast country. (AP Photo/Alfred de Montesquiou, File)

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