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Aden, YEMEN: A partial view of Aden oil refinery in Yemen, 15 September 2006. Four bombers and a security guard were killed today when Yemeni security forces foiled twin suicide bombings against oil installations just five days before the impoverished Arab nation goes to the polls. AFP PHOTO/KHALED FAZAA (Photo credit should read KHALED FAZAA/AFP via Getty Images)

Aden, YEMEN:  A partial view of Aden oil refinery in Yemen, 15 September 2006.  Four bombers and a security guard were killed today when Yemeni security forces foiled twin suicide bombings against oil installations just five days before the impoverished Arab nation goes to the polls.  AFP PHOTO/KHALED FAZAA  (Photo credit should read KHALED FAZAA/AFP via Getty Images)