Al-Azhar University student supporters of the Muslim Brotherhood and deposed President Mohamed Morsi make the four-finger Rabaa gesture as they hold tear gas canisters during clashes with riot police and residents of the area at the Al-Azhar University campus in Cairo's Nasr City district December 28, 2013. One student was killed on Saturday and scores were arrested when supporters of the Muslim Brotherhood clashed with Egyptian police at the Cairo campus of Al-Azhar University, state media reported. The "Rabaa" or "four" gesture is in reference to the police clearing of the Rabaa al-Adawiya protest camp on August 14. REUTERS/Stringer (EGYPT - Tags: POLITICS EDUCATION CIVIL UNREST)