Thousands of supporters of Egypt's ousted President Mohamed Morsi have marched through districts of Cairo and other cities to demand his reinstatement, ignoring warnings that security forces would open fire if protests turned violent. After a relative lull following the arrests of many Muslim Brotherhood leaders, the Friday rallies were the movement's biggest show of defiance since clashes two weeks ago in which hundreds of protesters were killed. Al Jazeera's Jamal Elshayyal reports.