A man carries an Egyptian police officer to an ambulance after Friday's blast at the Egyptian police headquarters in downtown Cairo. Khalil Hamra/AP hide caption

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A man in Cairo who said he had been wounded by a rubber bullet Friday gets help. Andre Pain /EPA/LANDOV hide caption

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President Obama, speaking Thursday from the island of Martha's Vineyard, Mass., said the U.S. has canceled joint military exercises with Egypt. Jacquelyn Martin/AP hide caption

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Posters of ousted Egyptian President Mohammed Morsi lay amid the rubble of a protest camp in Cairo after Wednesday's crackdown by government forces. Ahmed Assadi/EPA/Landov hide caption

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Egyptian President Mohammed Morsi held a "dialogue" in Cairo on Saturday. Overnight, an official announced the president would nullify a decree that gave him expanded powers. Maya Alleruzzo/AP hide caption

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Protesters gather in Tahrir Square in Cairo, Egypt, on Tuesday. Tens of thousands of Egyptians also gathered outside the presidential palace in Cairo in demonstrations that turned violent as tensions grew over President Mohammed Morsi's seizure of nearly unrestricted powers. Maya Alleruzzo/AP hide caption

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