Army soldiers sit atop an armoured personnel carrier stationed near a tribal gathering attended by tribesmen loyal to the Shi’ite Houthi group in Haz, west of the Yemeni capital Sanaa March 12, 2014. Fighters loyal to the Shi’ite tribe, who have repeatedly fought government forces since 2004, are trying to tighten their grip on the north as Yemen – home to one of al Qaeda’s most active branches – moves towards a federal system that gives more power to regional authorities. REUTERS/Khaled Abdullah (YEMEN – Tags: CIVIL UNREST MILITARY POLITICS TRANSPORT)