Cairo

Egyptian students, supporters of the Muslim Brotherhood and ousted Islamist president Mohamed Morsi,  flash the four finger symbol known as "Rabaa", meaning four in Arabic, which is associated with those killed in the crackdown on the Rabaa al-Adawiya protest camp in Cairo last year, as they demonstrate outside Cairo University, on April 9, 2014. An Egyptian appeals court rejected a request that new judges be appointed for two trials involving ousted Islamist president Mohamed Morsi, judicial officials said.

Mahmoud Khaled/AFP

Egyptian students, supporters of the Muslim Brotherhood and ousted Islamist president Mohamed Morsi, flash the four finger symbol known as “Rabaa”, meaning four in Arabic, which is associated with those killed in the crackdown on the Rabaa al-Adawiya protest camp in Cairo last year, as they demonstrate outside Cairo University

A special forces police officer fires rubber bullets during a demonstration at the front of Cairo University

Amr Abdallah Dalsh/Reuters

A special forces police officer fires rubber bullets as a protester raises his hand during a demonstration at the front of Cairo University, Egypt on Wednesday.

Nawal Farhat, 62-year-old, poses in her home at the El'Arafa necropolis, a cemetery located in the City of the Dead, in Cairo...Nawal Farhat, 62-year-old, poses in her home at the El'Arafa necropolis, a cemetery located in the City of the Dead, in Cairo March 25, 2014. People live and work amongst the dead in the 4-mile-long cemetery, which consists of tombs and mausoleums. While some reside in the area to be closer to their ancient heritage, others were forced to reside here from central Cairo due to increased urbanization since the 1950s, or for work opportunities. The poorest live in a slum area in the City of the Dead. REUTERS

Amr Abdallah Dalsh/Reuters

Nawal Farhat, 62, in her home at the El’Arafa necropolis, a cemetery in the City of the Dead, in Cairo. People live and work among the dead in the four-mile-long cemetery, which consists of tombs and mausoleums. While some reside in the area to be closer to their ancient heritage, others were forced to reside here from central Cairo due to increased urbanization since the 1950s, or for work opportunities. The poorest live in a slum area in the City of the Dead.

An Egyptian policeman reacts as he walks through the site of a car bomb explosion that struck the Cairo police headquarters today

Mahmud Khaled/AFP

An Egyptian policeman walks through the site of a car bomb explosion that struck the Cairo police headquarters on Friday. Read more

Family members run away from tear gas during clashes between Egypt's security forces and supporters of ousted President Mohammed Morsi in Cairo, Egypt, Friday, Jan. 17, 2014. Morsi supporters held sporadic protests against this week's constitutional referendum as authorities said there was a deadly clash.

Aly Hazzaa/AP

Family members run away from tear gas during clashes between Egypt’s security forces and supporters of ousted President Mohammed Morsi in Cairo, Egypt

Members of the Egyptian security forces stand guard outside a polling station near The Saladin Citadel (background) on Mokattam hill near the center of Cairo during the second day of voting on a new constitution on January 15, 2014. Egyptians resumed voting in the constitutional referendum, with turnout expected to hold the key to a likely presidential bid by army chief Abdel Fattah al-Sisi after clashes killed nine the previous day.

Mahmoud Khaled/AFP

Members of the Egyptian security forces stand guard outside a polling station near the Saladin Citadel on Mokattam hill near the centre of Cairo during the second day of voting on a new constitution on Wednesday.

An Egyptian ululates in front of a polling station after casting her vote in Cairo, Egypt, Tuesday, Jan. 14, 2014. Egyptians have started voting on a draft for their country's new constitution that represents a key milestone in a military-backed roadmap put in place after President Mohammed Morsi was overthrown in a popularly backed coup last July. (AP Photo/Amr Nabil)

Amr Nabil/AP

Voting starts on a draft for Egypt’s new constitution that represents a key milestone in a military-backed road map put in place after President Mohammed Morsi was overthrown in a popularly backed coup in July. Read more

A supporter of the Muslim Brotherhood makes the Rabaa four-fingered gesture in front of a burning police vehicle in Cairo January 10, 2014. The four-fingered "Rabaa" sign is in reference to the police clearing of the Rabaa al-Adawiya protest camp on August 14 last year that killed hundreds of supporters of ousted President Mohamed Mursi who were camped out in Cairo.

Al Youm Al Saabi newspaper.Reuters

A supporter of the Muslim Brotherhood makes the Rabaa four-fingered gesture in front of a burning police vehicle in Cairo on Friday. The gesture has become a symbol of protest and refers to the clearing of the Rabaa al-Adawiya camp by security forces on August 14 last year that killed scores of supporters of ousted President Mohamed Morsi.

Egyptian students who support the Muslim Brotherhood (background) shoot fireworks at riot policemen (foreground) during clashes outside the University of Cairo campus in the capital

Mahmoud Khaled/AFP

Egyptian students who support the Muslim Brotherhood shoot fireworks at riot policemen during clashes outside the University of Cairo campus in the capital Cairo.

Female students of Al-Azhar University shout slogans against the military and interior ministry while gesturing with four fingers after last night's clashes as they block Moustafa Al Nahas street in front of Al-Azhar University Campus...Female students of Al-Azhar University, supporters of the Muslim Brotherhood and ousted Egyptian President Mohamed Mursi, shout slogans against the military and interior ministry while gesturing with four fingers after last night's clashes as they block Moustafa Al Nahas street in front of Al-Azhar University Campus at Cairo's Nasr City district, November 21, 2013. A student was shot dead in clashes late Wednesday between supporters of ousted Egyptian President Mohamed Mursi and security forces at Al-Azhar University in Cairo, state newspaper al-Ahram reported on Thursday. The "Rabaa" or "four" gesture is in reference to the police clearing of the Rabaa al-Adawiya protest camp on August 14.

Amr Abdallah Dalsh/Reuters

Female students of Al-Azhar University, supporters of the Muslim Brotherhood and ousted Egyptian president Mohamed Morsi, shout slogans against the military and interior ministry as they block Moustafa Al Nahas street in front of university campus at Cairo’s Nasr City district