Red Cross medics help an injured man during an evacuation of people, wounded by fighting in Dammaj of Yemen’s northwestern province of Saada, at the Saada airport November 14, 2013. A deadly assault by Shi’ite Houthi rebels on a Salafi Islamic school planted in their mountain heartland could ignite wider sectarian conflict in Yemen, where instability has already helped al Qaeda militants to take root. REUTERS/Stringer (YEMEN – Tags: POLITICS CIVIL UNREST)