Muslim Brotherhood supporters throw stones towards opponents during clashes on April 19, in central Cairo.

Egyptian protesters clash near a bus belonging to Muslim Brotherhood supporters burns after it was reportedly set alight by anti- government protesters in Cairo, Egypt, Friday, April 19.

Muslim Brotherhood members hit an anti-government protester during clashes near Cairo's Tahrir Square, April 19.

Egyptian protesters chant slogans against Islamist President Mohammed Morsi slogans during a protest in front of the prosecutor general's office in Cairo, Egypt, on March 29, 2013. Hundreds of activists demonstrated to show solidarity with political activists charged by the prosecutor general with inciting violence during last week's clashes near the Muslim Brotherhood's Cairo headquarters. The Arabic banner at left reads, "none can threaten us," and at center, "freedom for activist Hassan Mustafa."

Egyptian political activists, victims and prisoners' relatives shout slogans during a protest against current prosecutor general Talaat Abdallah outside Cairo High Court on March 29, 2013 in Egypt. An Egyptian court on March 27 overturned a decision by President Mohamed Morsi to sack prosecutor general Abdel Meguid Mahmoud and ordered his reinstatement, state media reported. The ruling by the appeals court will once again put the presidency on a collision course with the judiciary, while any enforcement of its terms remains trapped in a legal labyrinth.

An Egyptian man bites the hand of a fellow protester over a dispute whether or not the military should take control again during a protest against Egyptian President Mohamed Morsi and the Muslim Brotherhood in front of the Prosecutor-General's office in Cairo, Egypt, on March 29, 2013.

Egyptian protesters hang an Arabic banner reading, "people demand an arrest warrant to the prosecutor general" during a protest in front of the prosecutor general's office in Cairo, Egypt, on March 29, 2013.

An anti-Morsi protester stands with the national flag after protesters burned Muslim Brotherhood buses during clashes near the Muslim Brotherhood's national headquarters in Cairo's Moqattam district on March 22, 2013.

Muslim Brotherhood supporters conduct Friday noon prayers in front of the main headquarters of the Brotherhood in Cairo on March 22, 2013.

Egyptians shout anti-Muslim Brotherhood slogans during a march from downtown to the main Brotherhood headquarters in the hilltop neighborhood of Muqattam, Cairo, Egypt, on March 22, 2013. Thousands of protesters from different areas of Cairo are marching on Friday to express their rejection of the Muslim Brotherhood and President Mohammed Morsi's rule.

Supporters of the Egyptian Muslim Brotherhood clash with anti-government protesters near the movements' headquarters in Cairo on March 22, 2013.

Anti-Morsi protesters carry a Muslim Brotherhood member after hitting him during clashes near the Muslim Brotherhood's national headquarters in Cairo on March 22, 2013.

Egyptian policemen write a report at a destroyed branch headquarters of the Muslim Brotherhood after protesters broke in to the building in Cairo, Egypt, on March 22, 2013.

An Egyptian anti-Muslim Brotherhood protester throws a stone towards Muslim Brotherhood supporters during clashes near the party's national headquarters in Cairo on March 22.

An injured Egyptian anti-Muslim brotherhood protester is taken away by his comrades, during clashes near the Muslim Brotherhood's national headquarters in Cairo, Egypt, on March 22.

An injured security official is carried from a police officers club in the upscale neighborhood of Zamalek, after protesters set fires following a court verdict in Cairo, March 9. Fans of Cairo's Al-Ahly club have stormed Egypt's soccer federation headquarters and a nearby police club, and set them ablaze after a court acquitted seven of nine police official on trial for their alleged part in deadly stadium melee.

Egyptian men try to extinguish a fire in a building in the Police Club compound in Cairo, March 9.

Policemen try to extinguish fire at a police club set by protesters following a court verdict in Cairo, March 9.

Supporters of the 'Al Ahly' soccer club celebrate after an Egyptian court confirmed verdicts in the Port Said soccer match riots, at the Al-Ahly football club in Cairo, March 9.

Smoke and fire rises from the Egyptian Soccer Federation after protesters set fire following a court verdict in, Cairo, March 9. An Egyptian court on Saturday confirmed the death sentences against 21 people for taking part in a deadly soccer riot but acquitted seven police officials for their alleged role in the violence. Suspected fans enraged by the verdict torched the soccer federation headquarters and a police club in Cairo in protest.

Egyptian security forces keep watch as protesters burn tires in Port Said, Egypt, March9. Twenty-one people sentenced to death for their role in the fatal 2012 football riots in the Egyptian city of Port Said had their sentences confirmed, sparking riots in Port Said and Cairo.

Protesters evacuate a wounded protester from the scene of clashes in downtown Cairo, March 9. Security officials say a protester has died during clashes between police and hundreds of stone-throwing demonstrators in central Cairo. The officials say the protester died Saturday on a Nile-side road where clashes have been taking place daily between anti-government protesters and police near two luxury hotels and the U.S. and British embassies.

An Egyptian protester evacuates a wounded man during clashes between protesters and riot police near the state security building in Port Said, Egypt, on March 6.

An Egyptian man sets tiers ablaze during clashes in Port Said, Egypt, on March 6.

Egyptian army soldiers arrest an alleged rioter during clashes in Port Said, Egypt, on March 6.

Egyptians react from tear gas fired by riot police during clashes near the state security building in Port Said, Egypt, on March 6.

Anti-Morsi protesters are seen through a banner with pictures of people, who were killed in Port Said demonstrations since violence erupted after the court verdict on the sentencing of 21 people, at a camp in front of the Governorate General headquarters in Port Said city, 105 miles northeast of Cairo on March 5.

Egyptians gather at the site of a balloon crash where the debris from the burned gondola rests, outside al-Dhabaa village, just west of the city of Luxor on Feb. 26.

Rescue workers remove a body from the scene of a balloon crash outside al-Dhabaa village, just west of the city of Luxor, 320 miles south of Cairo, on Feb. 26.

Egyptians work at the site where a a hot air balloon crashed, in a field next to the southern Egyptian town of Luxor, on Feb. 26.

An Egyptian rescue worker collects remains near the scene of a balloon crash outside al-Dhabaa village, just west of the city of Luxor on Feb. 26.

Iran's President Mahmoud Ahmadinejad meets people as he visits the Al-Hussein mosque, named after Prophet Mohammed's grandson Hussein ibn Ali, in old Cairo on Feb. 5, 2013. Ahmadinejad was both kissed and scolded on Tuesday when he began the first visit to Egypt by an Iranian president since Tehran's 1979 Islamic revolution.

Demonstrators hold candles in memory of protester Mohammed Qorany, on Feb. 2, at the spot where he died in clashes, near the presidential palace in Cairo, Egypt. Protesters and rights groups have accused police of using excessive force this past week during a wave of mass demonstrations in cities around the country called by opposition politicians, trying to wrest concessions from Morsi.

A demonstrator lights candles in memory of protester Mohammed Qorany at the spot where he died in clashes, on Feb. 2, near the presidential palace in Cairo, Egypt.

Protesters opposing Egyptian President Mohammed Morsi march despite a nighttime curfew in the city of Suez on Jan. 28. Egyptian protesters defied a nighttime curfew in restive towns along the Suez Canal, attacking police stations and ignoring emergency rule imposed by Islamist President Morsi to end days of clashes that have killed at least 52 people. Egypt's army chief said political strife was pushing the state to the brink of collapse - a stark warning from the institution that ran the country until last year as Cairo's first freely elected leader struggles to contain bloody street violence.

A masked Egyptian protester flashes the victory sign during clashes with police, background, near Tahrir Square, Cairo, on Jan. 28.

Egyptians attend the funeral of several victims the previous day's violence in Port Said, Egypt, on Jan. 28. The worst violence in Egypt this past weekend was in the Mediterranean coastal city of Port Said, where at least 44 people died in two days of clashes. The unrest was sparked on Saturday by a court conviction and death sentence for 21 defendants involved in a mass soccer riot in the city's main stadium on Feb. 1, 2012, that left 74 dead.

An Egyptian protester covers his face with a plastic bag to protect himslef from tear gas during clashes with riot police near Tahrir Square in Cairo on Jan. 28.

A protester throws a tear gas canister back at riot police during clashes near Tahrir Square in Cairo on Jan. 28.

Riot police run towards anti-government protesters during clashes near Tahrir Square in Cairo on Jan. 28.

Egyptians carry the coffins of the previous day's violence in Port Said, Egypt, on Jan. 28.

Protesters try to convince an elderly woman to move out of the way after she sat down in between opposing sides during a demonstration in Tahrir Square, Cairo on Jan. 27, 2013.

A mass funeral in Port Said on Jan. 27, 2013. Tens of thousands of mourners poured into the streets of the restive Egyptian city of Port Said on Sunday for a funeral for most of the 37 people killed in rioting a day earlier, chanting slogans against Islamist President Mohammed Morsi.

A protester stands by a fire lit during clashes with riot police near Tahrir Square in Cairo on Jan. 27, 2013.

A protester opposing Egyptian President Mohamed Morsi throws a tear gas canister, which was earlier thrown by riot police, during clashes along Qasr Al Nil bridge, which leads to Tahrir Square in Cairo, Egypt, Jan. 27. Egyptian President Mohamed Morsi announced on Sunday he was imposing a state of emergency for 30 days in three cities along the Suez Canal that have been the scene of the worst violence that flared over the weekend, killing more than 45 people.