Cairo: Egyptian riot police have fired tear gas and locked down Cairo's Tahrir Square and several other main streets as clashes broke out during a march by Islamist supporters of ousted President Mohammed Morsi.
Troops sealed off the square with tanks and barbed wire, diverting traffic from the central plaza Friday as thousands of Morsi supporters marched from several districts in the city, with plans to converge into the square.
Security forces also fired tear gas and shot in the air elsewhere in the city as local residents and protesters clashed and threw stones at each other.
Egypt's Muslim Brotherhood group, from which Morsi hails, is escalating protests to coincide with commemorations of Egypt's Oct. 6 opening strike in the 1973 war with Israel.
