At least Eight people were killed **rth of Yemen's capital on Tuesday after Shi'ite Muslim tribesmen fought with Sunni rivals and the army, local sources said. There have been months of intense sectarian fighting since last year, threatening attempt at national reconciliation in Yemen, a neighbour of major oil exporter Saudi Arabia and home to one of al Qaeda's most active wings. The fighting on Tuesday was between Shi'ite Houthis and Sunni tribesmen who back the Yemeni army. Fighters loyal to the Shi'ite Houthi tribe, who have repeatedly fought government forces since 2004, are trying to tighten their grip on the **rth as Yemen moves towards a federal system that will give more power to regions.