A soldier sets up barbed wire in anticipation of protesters outside the constitutional court in Cairo on Sunday, August 18. The protesters never showed up. Over the past week, about 900 people -- security forces as well as citizens -- have been killed. Deaths occurred when the military used force to clear supporters of ousted President Mohamed Morsy from two sit-in sites in Cairo on Wednesday, and violence raged after Morsy supporters staged demonstrations Friday. Look back at Egypt's unrest.