Protesters shout slogans and wave Yemeni flags as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)