A Yemeni doctor uses the light of his mobile phone to help other doctors clean the wounds of an anti-government protestor in a field hospital, after he was injured in clashes with Yemeni security forces in Sanaa, Yemen, Wednesday, April 27, 2011. Yemeni security forces opened fire on a massive anti-government demonstration in the capital Sanaa on Wednesday, killing a number protesters and wounding some 100, a doctor at the scene said. (AP Photo/Muhammed Muheisen)