Members of the Shi'ite Muslim Houthi group ride a truck in Yemen's northwestern city of Amran July 14, 2014. Yemen's president on Sunday demanded the withdrawal of Shi'ite Muslim tribesmen from the provincial city of Amran captured on July 8, in a stand-off that threatens to intensify turmoil in the Arab country. The Shi'ite Houthis, named after the tribe of their leader, said their fight was against rivals loyal to the Islamist Islah party. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)