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Supporters of Egypt's ousted President Mohammed Morsi carry an injured man to a field hospital following clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left dozens of protesters dead following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( Mideast Egypt )

CAIRO, EGYPT - JULY 27: A streak of dried blood lies on the ground at the location suppoters of deposed Egyptian President Mohammed Morsi were reportedly killed in fighting between pro-Morsi demonstrators and Egyptian security forces overnight, near the Rabaa al Adweya Mosque in the district of Nasr on July 27, 2013 in Cairo, Egypt. Morsi supporters had gathered at a sit in protest in Nasr City on Friday to continue demonstrations against the overthrow of Morsi, Egypt's first democratically elected leader, on July 3 by the Egyptian Armed Forces. Muslim Brotherhood leaders had called for pro-Morsi protesters to return to the streets on Friday in response to a speech made Wednesday by the Chief of Egypt's Armed Forces, General Abdel Fattah al-Sissi, who called for mass pro-military protests across Egypt on Friday against 'violence and terrorism' and in support of the military's overthrow of Morsi. (Photo by Ed Giles/Getty Images) ( 174529424 )

Egyptians identify bodies of supporters for Egypt's ousted President Mohammed Morsi after they were killed in clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Hassan Ammar) ( Mideast Egypt )

Doctors treat a supporter of Egypt's ousted President Mohammed Morsi injured during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Ahmed Abdel Fattah) ( APTOPIX Mideast Egypt )

An Egyptian man reacts while doctors treat a supporter of Egypt's ousted President Mohammed Morsi injured during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left dozens of protesters dead following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( Mideast Egypt )

CAIRO, EGYPT - JULY 27: A member of the medical staff of a field hospital sits in front of a poster of deposed Egyptian President Mohammed Morsi after tending to the bodies of pro-Morsi supporters reportedly killed in fighting between pro-Morsi demonstrators and Egyptian security forces overnight, near the Rabaa al Adweya Mosque in the district of Nasr on July 27, 2013 in Cairo, Egypt. Morsi supporters had gathered at a sit in protest in Nasr City on Friday to continue demonstrations against the overthrow of Morsi, Egypt's first democratically elected leader, on July 3 by the Egyptian Armed Forces. Muslim Brotherhood leaders had called for pro-Morsi protesters to return to the streets on Friday in response to a speech made Wednesday by the Chief of Egypt's Armed Forces, General Abdel Fattah al-Sissi, who called for mass pro-military protests across Egypt on Friday against 'violence and terrorism' and in support of the military's overthrow of Morsi. (Photo by Ed Giles/Getty Images) ( 174529484 )

Supporters of Egypt's ousted President Mohammed Morsi gather outside a field hospital following clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Police fired tear gas to disperse hundreds of Morsi supporters, setting off clashes that lasted for hours and left tens of people dead. The partial Arabic writing reads "He thinks no one." (AP Photo/Khalil Hamra) ( APTOPIX Mideast Egypt )

Supporters of Egypt's ousted President Mohammed Morsi show tear gas and spent bullet casings used during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Hassan Ammar) ( Mideast Egypt )

A supporter of deposed Egyptian President Mohamed Mursi throws a tear gas canister, initially fired by the police, during clashes in Nasr city area, east of Cairo July 27, 2013. Egyptian security forces shot dead at least 70 supporters of ousted President Mohammed Mursi early on Saturday, his Muslim Brotherhood said, deepening the turmoil which has convulsed Egypt for weeks. REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

Anti-Mursi demonstrators illuminate the night sky with laser pointers during a mass rally showing support for the army at Tahrir Square in Cairo in this July 26, 2013 handout photo by the Egyptian Army. At least seven people were killed and hundreds wounded in scattered violence across Egypt during mass rallies on Friday for and against the army's overthrow of Islamist President Mohamed Mursi, who was placed under investigation for murder. Picture taken July 26, 2013. REUTERS/Egyptian Army/Handout via Reuters ( EGYPT-PROTESTS/ )

Supporters of Egyptian Armed Forces General Ahmed Fattah al-Sisi rally at Tahrir Square in Cairo on July 26, 2013. Egypt formally detained Mohamed Morsi for allegedly abetting militants in murdering policemen and staging prison escapes, as clashes during massive rallies by his opponents and loyalists killed five people. KHALED DESOUKI/AFP/Getty Images ( 521665162 )

A car that members of the Muslim Brotherhood and supporters of deposed Egyptian President Mohamed Mursi say was burnt by police and plain-clothed people is seen during clashes in Nasr city area, east of Cairo July 27, 2013. The Muslim Brotherhood said at least 31 people died early Saturday after security forces attacked a protest by supporters of deposed President Mohamed Mursi in Cairo. REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/VIOLENCE-TOLL )

Supporters of deposed Egyptian President Mohamed Mursi run from tear gas thrown at them by police during clashes in Nasr city area, east of Cairo, July 27, 2013. Egyptian security forces shot dead at least 70 supporters of ousted President Mohamed Mursi on Saturday, his Muslim Brotherhood said, days after the army chief called for a popular mandate to tackle "violence and terrorism". REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

Supporters of deposed Egyptian President Mohamed Mursi hold a Mursi poster as they stand on a barricade built to separate them from police during clashes in Nasr city area, east of Cairo, July 27, 2013. Egyptian security forces shot dead at least 70 supporters of ousted President Mohamed Mursi on Saturday, his Muslim Brotherhood said, days after the army chief called for a popular mandate to tackle "violence and terrorism". REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

The corpse of a supporter for Egypt's ousted President Mohammed Morsi after he was killed during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, lies down on the floor of a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left dozens of protesters dead following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Hassan Ammar) ( Mideast Egypt )

A picture taken on July 26, 2013 shows an helicopter flying above crowded Tahrir Square in Cairo during a rallye of opponents to deposed Egyptian president Mohamed Morsi. At Tahrir Square, tens of thousands of anti-Morsi supporters gathered in response to a call by the army chief General Abdel Fattah al-Sisi on Egyptians to show their support for a security clampdown on "terrorism". KHALED DESOUKI/AFP/Getty Images ( 521665127 )

Supporters of Egypt's ousted President Mohammed Morsi carry an injured man to a field hospital following clashes with security forces at Nasr City, where pro-Morsi protesters have held a weekslong sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Police fired tear gas to disperse hundreds of Morsi supporters, setting off clashes that lasted for hours and left tens of people dead. (AP Photo/Khalil Hamra) ( Mideast Egypt )

Doctors move the corpse of a supporter of Egypt's ousted President Mohammed Morsi killed during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( Mideast Egypt )

CAIRO, EGYPT - JULY 27: Supporters of deposed Egyptian President Mohammed Morsi protest outside a field hospital where the bodies of supporters of Morsi are brought having been reportedly killed in fighting between pro-Morsi demonstrators and Egyptian security forces overnight, near the Rabaa al Adweya Mosque in the district of Nasr on July 27, 2013 in Cairo, Egypt. Morsi supporters had gathered at a sit in protest in Nasr City on Friday to continue demonstrations against the overthrow of Morsi, Egypt's first democratically elected leader, on July 3 by the Egyptian Armed Forces. Muslim Brotherhood leaders had called for pro-Morsi protesters to return to the streets on Friday in response to a speech made Wednesday by the Chief of Egypt's Armed Forces, General Abdel Fattah al-Sissi, who called for mass pro-military protests across Egypt on Friday against 'violence and terrorism' and in support of the military's overthrow of Morsi. (Photo by Ed Giles/Getty Images) ( 174529557 )

Supporters of Egypt's ousted President Mohammed Morsi carry an injured man to a field hospital on the back of a motorcycle following clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Police fired tear gas to disperse hundreds of Morsi supporters, setting off clashes that lasted for hours and left tens of people dead. (AP Photo/Khalil Hamra) ( Mideast Egypt )

An Egyptian man sits beside his comrade, a supporter of Egypt's ousted President Mohammed Morsi, injured during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Hassan Ammar) ( APTOPIX Mideast Egypt )

Supporters of Egypt's ousted President Mohammed Morsi comfort a relative of a comrade killed during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( Mideast Egypt )

Supporters of Egypt's ousted President Mohammed Morsi comfort a relative of a comrade killed during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( Mideast Egypt )

Supporters of deposed Egyptian President Mohamed Mursi throw stones from behind a makeshift barricade they built as they take cover from the police during clashes in Nasr city area, east of Cairo July 27, 2013. At least 70 people died on Saturday after security forces attacked supporters of deposed President Mohamed Mursi in Cairo, Muslim Brotherhood spokesman Gehad El-Haddad said, adding the toll could be much higher. REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

A supporter of deposed Egyptian President Mohamed Mursi tries to take cover as a police officer uses a shotgun during clashes in Nasr city area, east of Cairo July 27, 2013. At least 70 people died on Saturday after security forces attacked supporters of deposed President Mohamed Mursi in Cairo, Muslim Brotherhood spokesman Gehad El-Haddad said, adding the toll could be much higher. REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

A supporter of Egypt's ousted President Mohammed Morsi shows his bloody hands after clashes with security forces at Nasr City, near where pro-Morsi protesters have held a weeks-long sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( APTOPIX Mideast Egypt )

Egyptians mourn supporters of Egypt's ousted President Mohammed Morsi after they were killed in clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. Arabic reads, "Yes for the legitimacy." (AP Photo/Hassan Ammar) ( Mideast Egypt )

The body of a Muslim Brotherhood protester, shot dead in the Egyptian capital after violence erupted the night before, is evacuated as mourners watch inside a field hospital in Cairo on July 27, 2013. The bloodshed came hours after the military-backed interior minister, Mohammed Ibrahim, warned a long-running sit-in at Cairo's Rabaa al-Adawiya mosque by Morsi loyalists would be ended "in the framework of the law". FAYEZ NURELDINE/AFP/Getty Images ( 521666815 )

Medical volunteers and supporters of deposed Egyptian President Mohamed Mursi comfort a man, who lost a relative during clashes with police, at a field hospital in Nasr city area, east of Cairo, July 27, 2013. Egyptian security forces shot dead at least 70 supporters of ousted President Mohamed Mursi on Saturday, his Muslim Brotherhood said, days after the army chief called for a popular mandate to tackle "violence and terrorism". REUTERS/Asmaa Waguih ( EGYPT-PROTESTS/ )

Anti-Mursi demonstrators gather for a mass rally to show support for the army near Tahrir Square in Cairo in this July 26, 2013 handout photo by the Egyptian Army. At least seven people were killed and hundreds wounded in scattered violence across Egypt during mass rallies on Friday for and against the army's overthrow of Islamist President Mohamed Mursi, who was placed under investigation for murder. Picture taken July 26, 2013. REUTERS/Egyptian Army/Handout via Reuters ( EGYPT-PROTESTS/ )

A supporter of Egypt's ousted President Mohammed Morsi comforts a relative of wounded man, injured during clashes with security forces at Nasr City, where pro-Morsi protesters have held a weeks-long sit-in, in a field hospital in Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and supporters of ousted Egyptian President Mohammed Morsi in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. (AP Photo/Manu Brabo) ( MB101 )

A supporter of Egypt's ousted President Mohammed Morsi comforts a relative of a man injured during clashes with security forces in a field hospital in Nasr City, Cairo, Egypt, Saturday, July 27, 2013. Overnight clashes between security forces and Morsi supporters in east Cairo left scores of protesters dead and hundreds injured following a day of massive pro-military rallies backing a tough hand against Morsiís backers and the Muslim Brotherhood group from which he hails. Arabic on headband of man holding the Quran reads, "There is no God but God and Mohammed is his messenger." (AP Photo/Hassan Ammar) ( APTOPIX Mideast Egypt )

An Egyptian man mourns the death of a relative, shot dead in the Egyptian capital after violence erupted the night before, outside the Muslim Brotherhood field hospital in Cairo on July 27, 2013. The bloodshed came hours after the military-backed interior minister, Mohammed Ibrahim, warned a long-running sit-in at Cairo's Rabaa al-Adawiya mosque by Morsi loyalists would be ended "in the framework of the law". FAYEZ NURELDINE/AFP/Getty Images ( 521666847 )

Supporters of Egypt's ousted President Mohammed Morsi carry an injured man to a field hospital following clashes with security forces at Nasr City, where pro-Morsi protesters have held a weekslong sit-in, in Cairo, Egypt, Saturday, July 27, 2013. Police fired tear gas to disperse hundreds of Morsi supporters, setting off clashes that lasted for hours and left tens of people dead. (AP Photo/Khalil Hamra) ( APTOPIX Mideast Egypt )

Egyptians mourn supporters of Egypt's ousted President Mohammed Morsi who were killed in overnight clashes with security forces, in a field hospital, in Nasr City, Cairo, Egypt, Saturday, July 27, 2013. Clashes erupted early Saturday in Cairo between security forces and supporters of Morsi, killing scores of protesters and overwhelming field hospitals with the wounded, the Health Ministry said, in an outburst of violence that put the possibility of political reconciliation in the deeply divided nation ever further out of reach. A portrait of Morsi is taped to the wall. (AP Photo/Hassan Ammar) ( APTOPIX Mideast Egypt )