Supporters of Egypt's Islamist President Mohammed Morsi wave his posters and national flags as they fill a public square outside of the Rabia el-Adawiya Mosque in Cairo, not far from the presidential palace, during a rally in Cairo, Saturday, June 29, 2013. Thousands of supporters and opponents of Egypt's embattled Islamist president are holding rival sit-ins on the eve of what are expected to be massive opposition-led protests aimed at forcing Mohammed Morsi's ouster. The demonstrations early Saturday follow days of deadly clashes in a string of cities across the country that left at least seven people dead, including an American, and hundreds injured.