Yemeni policemen stand guard at a roadblock outside the U.S. [Getty Images]

YEMEN - MARCH 30: Yemeni policemen stand guard at a roadblock outside the U.S. embassy in Sana'a, Yemen, on Monday, March 30, 2009. Yemen, the ancestral homeland of al-Qaeda leader Osama bin Laden, is facing a rising tide of terrorist attacks as militants strengthen their base in the poorest Arab nation, which borders Saudi Arabia. (Photo by Khaled Al-Mahdi/Bloomberg via Getty Images)

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