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Photo by: Muhammed Muheisen

A Yemeni anti-government demonstrator reacts after other demonstrators set on fire a vehicle belonging to supporters of President Ali Abdullah Saleh during clashes in Sanaa, Yemen, Tuesday, Feb. 22, 2011. Yemen's embattled leader rejects demands that he step down, calling demonstrations against his regime unacceptable acts of provocation and offers to begin a dialogue with protesters. (AP Photo/Muhammed Muheisen)

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