Security Tightens as Rivals Clash Ahead of Egypt Referendum
Description:Tight security across Egypt - a day before voting on a controversial referendum of the new constitution. More than one hundred thousand soldiers in amoured vehicles are being deployed to protect polling stations - and government buildings in Cairo and other major cities. But, despite a heavy military presence, scuffles broke out Friday - between opponents and supporters of Islamist President Mohamed Mursi.(1:05)