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Medics transport an injured Yemeni man on a gurney as he arrives at a hospital in Sanaa after being injured when two suicide bombers hit a Shiite mosque in the Yemeni capital in quick succession on September 2, 2015 in an attack reminiscent of previous bombings by the Islamic State group, sources told AFP. The Islamic State (IS) group claimed the twin bombing in a statement posted on Twitter. AFP PHOTO / MOHAMMED HUWAIS (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)

Medics transport an injured Yemeni man on a gurney as he arrives at a hospital in Sanaa after being injured when two suicide bombers hit a Shiite mosque in the Yemeni capital in quick succession on September 2, 2015 in an attack reminiscent of previous bombings by the Islamic State group, sources told AFP. The Islamic State (IS) group claimed the twin bombing in a statement posted on Twitter. AFP PHOTO / MOHAMMED HUWAIS        (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)