One person was killed and 27 injured after dozens of supporters of Egypt\'s ousted president Mohammed Morsi clashed with opponents carrying out a sit-in in Tahrir Square on Monday, security sources confirmed. Amr Mohammed el-Sayed Salama, 21, was shot dead, a source from the interior ministry said. Twenty people were arrested from the square as police fired tear gas to disperse the clashes, and armoured vehicles were deployed at the entrance of the ?square from the direction of Kasr al-Nil Bridge. Tensions are running high in Egypt nearly three weeks after the army ousted Morsi following massive protests calling for him to go. His supporters, however, have pressed demonstrations of their own calling for his reinstatement. Additional source: AFP