Where in the world could they strike?

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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    Where in the world could they strike?

CNN's Tom Foreman shows an interactive model of the main areas on terrorism alert around the world.