EGYPT – Protests set for Sunday (Reuters) "Egypt is the largest country in the Arab world.The entire region is concerned that, if Egypt continues with this constant instability, that has adverse effects more broadly." U.S. President Barack Obama said this on Saturday when he called on Egypt's government and opposition to engage each other in constructive dialogue and prevent violence spilling out across the region. Bloodshed on Friday killed three people, including an American student, and mass rallies are planned for Sunday aimed at unseating Islamist President Mohamed Mursi. Rival protesters in Egypt's capital insist they want to avoid bloodshed during mass rallies against President Mohamed Mursi on Sunday. But reports say that both sides appear ready to confront each other. Nathan Morley reports.