Shi'ite Muslim rebels hold up their weapons during a rally against air strikes in Sanaa March 26, 2015. Warplanes from Saudi Arabia and Arab allies struck Shi'ite Muslim rebels fighting to oust Yemen's president on Thursday, in a major gamble by the world's top oil exporter to check Iranian influence in its backyard without direct military backing from Washington. The poster reads: "The leader of the Kuranic march Abdul Malik Badruddin al-Houthi." REUTERS/Khaled Abdullah