Unrest rises in Egypt

Egyptian riot police fired volleys of tear gas and locked down Cairo's Tahrir Square Friday as clashes broke out in a rare push by Islamist supporters of the ousted president to take control of the iconic square, leaving at least four dead. Using lines of armored vehicles and barbed wire, troops sealed off the square and diverted traffic after the Muslim Brotherhood, the group from which ousted president Mohammed Morsi hails, called on its supporters to march there.