Supporters of Islamist President Mohamed Mursi and his opponents hurled rocks at each other in Egypt's second city of Alexandria on Friday.<br/> <br />The Islamists had gathered in support of an Islamic vision of Egypt's future laid out in a draft constitution that will be put to a referendum on Saturday.<br/> <br />Police fired tear gas as scores of opponents of the constitution and thousands of Islamists hurled rocks across a security cordon near a mosque that was the focus of violence last week.<br/> <br />Mursi and his Islamist allies back the draft constitution as a vital step in Egypt's transition to democracy almost two years after the fall of Hosni Mubarak.<br/> <br />The opposition says the draft, drawn up by an Islamist-dominated assembly, is a recipe for deepening divisions and more violence.<br/> <br />The vote had to be split over two days as a judges' boycott meant there were not enough legal observers for the whole country to vote together.