Egyptian protesters pose next to a police vehicle set afire during clashes outside the presidential palace in Cairo on Friday, April 26, 2013. Dozens of mostly masked protesters hurled stones and firebombs in clashes with riot police. Protests have become a weekly routine in Egypt, as the country has plunged in turmoil during most of the past two years since the 2011 uprising that ousted longtime President Hosni Mubarak. (AP Photo/Hussein Tallal)

Photo by: Hussein Tallal

Egyptian protesters pose next to a police vehicle set afire during clashes outside the presidential palace in Cairo on Friday, April 26, 2013. Dozens of mostly masked protesters hurled stones and firebombs in clashes with riot police. Protests have become a weekly routine in Egypt, as the country has plunged in turmoil during most of the past two years since the 2011 uprising that ousted longtime President Hosni Mubarak. (AP Photo/Hussein Tallal)