An Egyptian protester throws a tear gas canister back at security forces during clashes near Tahrir Square in Cairo,Egyptian police are clashing with anti-government protesters for a fifth day in Cairo. Tens of thousands of protesters in Tahrir Square have rejected a promise by Egypt's military ruler to speed up a presidential election to the first half of next year. They want Field Marshal Hussein Tantawi to step down immediately in favor of an interim civilian council. Cairo--EGYPT 24/11/2011 .