A Saudi soldier stands guard near a damaged house in Jizan on the border with Yemen November 3, 2014. Gains by the Shi'ite Houthi rebel movement in Yemen are ringing alarm bells in Saudi Arabia, concerned for what it means for its vulnerable southern border, already the conduit for a constant flow of illicit activity. Picture taken November 3, 2014. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: POLITICS CIVIL UNREST)