Protesters shout slogans during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz. Rival Yemeni forces clashed in the capital Sanaa killing two people, as the opposition awaited clarification from Gulf Arab mediators on the timeframe for a proposed transfer of the president's powers. April 12, 2011.(Khaled Abdullah/Reuters) #Yemen #ArabRevolution