Police fire tear gas at clashing protesters in Alexandria, Egypt, on the eve of a second day of polling on a controversial constitutional referendum.
Police Fire Tear Gas at Egyptian Protesters

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Riot policemen stand between protesters opposing Egyptian President Mohamed Morsi and others supporting him (not pictured) in Alexandria, Egypt, December 21, 2012.

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A woman reacts as she stands before riot policemen separating opponents of Egyptian President Mohamed Morsi and Islamist supporters of the president in Alexandria, Egypt, December 21, 2012.