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An Egyptian protester stands above the entry of the US embassy in Cairo on September 11, 2012 during a demonstration against a film deemed offensive to Islam. Thousands of Egyptian demonstrators angered by the film produced by expatriate members of Egypt's Christian minority resident in the United States, tore down the US flag during the protest at the embassy. AFP PHOTO/ KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/GettyImages)
An Egyptian protester stands above the entry of the US embassy in Cairo on September 11, 2012 during a demonstration against a film deemed offensive to Islam. Thousands of Egyptian demonstrators angered by the film produced by expatriate members of Egypt's Christian minority resident in the United States, tore down the US flag during the protest at the embassy. AFP PHOTO/ KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/GettyImages)

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U.S. issues global travel alert

CNN's Elisa Labott reports on a travel warning issued by the U.S. State Department amid possible al Qaeda threats.

U.S. issues global travel alert

CNN's Elisa Labott reports on a travel warning issued by the U.S. State Department amid possible al Qaeda threats.