A boy, wounded during clashes between security forces and tribesmen loyal to Sheik Sadeq al-Ahmar, the head of the powerful Hashed tribe, lies in a hospital bed in Sanaa June 4, 2011. Thousands fled Sanaa on Saturday a day after President Ali Abdullah Saleh was wounded in an attack on his compound that marked a new stage in fighting which has brought Yemen closer to civil war. REUTERS/Ammar Awad (YEMEN - Tags: POLITICS CIVIL UNREST)