At least 51 people were killed in clashes across Egypt Sunday during violence between opponents and supporters of deposed president Mohamed Mursi.<br/> <br />Police fired tear gas at Mursi supporters in Cairo as they tried to march towards Tahrir Square.<br/> <br />Some supporters tried to flee in a boat, but ended up jumping into the Nile after police fired tear gas at the boat.<br/> <br />The country has been in the throws of turmoil since the army ousted Mursi in July after mass protests against his rule.<br/> <br />In a sign of more possible violence to come, an alliance including Mursi's Muslim Brotherhood urged Egyptians to protest from Tuesday and gather on Cairo's Tahrir Square on Friday
