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Photo by: Muhammed Muheisen

Supporters of the Yemeni government are seen through the smoke of a burning vehicle belonging to them destroyed and set on fire by anti-government demonstrators 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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