Several Egyptians help an injured man out of the site of a clash between security forces and supporters of ousted Islamist president Mohamed Morsi at Alf-Maskan Square in Cairo's Heliopolis district, Egypt, on Dec.27, 2013. At least three people have been killed nationwide in clashes between supporters of ousted Islamist President Mohamed Morsi and their opponents, the Interior Ministry said in a statement Friday. [Photo: Xinhua]