Rival sides in Egypt's political crisis are staging rallies in Cairo a day before the first round of voting begins on a contentious draft constitution.
The National Salvation Front of opposition groups has organised demonstrations at the presidential palace and in Cairo's Tahrir Square on Friday, after deciding to call on followers to vote "no" in the referendum scheduled for December 15 and 22.
Al Jazeera's Hoda Abdel-Hamid reports from Cairo
