Riot police stand across from supporters of the Muslim Brotherhood during a demonstration at Cairo University hours after a drive-by shooting killed several Egyptian policemen and wounded others during an overnight rally by Islamist students at another university, in Cairo, Egypt, Monday, May 20, 2014. A statement from an Al-Azhar student movement said the shooting took place after their rally had ended. The attack at Al-Azhar University raises security concerns ahead of presidential elections next week. (AP Photo/Ahmed Gamil)