Protesters run from security forces and tear gas and into Tahrir Square.<br/> <br />It's the fourth day of clashes in Cairo since protests marking Egypt's 2011 revolution began Thursday evening.<br/> <br />Dozens have died and hundreds have been wounded nationwide.<br/> <br />Stone-throwing, volleys of noxious gas and even live fire have become familiar over two years of sporadic unrest.<br/> <br />The latest violence and mounting death toll are challenging President Mohamed Mursi and his Islamist allies - whom opponents accuse of betraying the uprising that overthrew Hosni Mubarak.<br/> <br />Military forces also deployed in the northern city of Port Said Sunday following the deaths of at least 30 people in clashes with police.<br/> <br />Residents were protesting a court verdict that sentenced 21 people, most from the coastal city, to death over a football riot last year.<br/> <br />There have also been reports of gunshots amid a funeral procession for the victims of yesterday's protests.
