Egypt protests take deadly turn

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, July 27, 2013.

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.

Read more: Morsi backers defiant in face of Egyptian government threat

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, July 27, 2013.

A supporter of deposed Egyptian President Mohammed Morsi prays prior to the 'iftar' fast-breaking meal at a sit-in protest at the Rabaa al Adweya Mosque in the Nasr City district in Cairo, July 28, 2013.

Morsi supporters continued to protest at the Nasr City sit-in one day after scores of protesters were killed during a violent confrontation with Egyptian security forces near the Rabaa al-Adaweya mosque.

The bodies of Morsi supporters lie on the floor of a field hospital, after reportedly being killed in fighting between pro-Morsi demonstrators and Egyptian security forces near the Rabaa al Adweya Mosque in Cairo, July 27, 2013.

Bodies of Morsi supporters lie on the floor of a field hospital, after reportedly being killed in fighting between pro-Morsi demonstrators and Egyptian security forces, near the Rabaa al Adweya Mosque in Cairo, July 27, 2013.

A Morsi supporter chants slogans supporting the former leader during a protest near Cairo University in Giza, July 28, 2013.

A boy wears a tear gas mask as Morsi supporters pray at Nasr City, where protesters have installed a camp and hold daily rallies, in Cairo, July 28, 2013.

Egyptians mourn Morsi supporters who 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, July 27, 2013.

Morsi supporters pray at Nasr City, where protesters have installed a camp and hold daily rallies, in Cairo, July 28, 2013.

Morsi supporters chant slogans against Egyptian Defense Minister Gen. Abdel-Fattah el-Sissi at Nasr City in Cairo, July 28, 2013.

The corpse of a Morsi supporter, killed during clashes with security forces at Nasr City, lies on the floor of a field hospital in Cairo, July 27, 2013.

Doctors treat a Morsi supporter who was injured during clashes with security forces in Cairo, in a field hospital close by to where pro-Morsi protesters have held a weeks-long sit-in, July 27, 2013.

Morsi supporters throw stones at riot police during clashes at Nasr City, Cairo, July 26, 2013.

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, in a field hospital in Cairo, July 27, 2013.

Supporters of Egypt's top military officer, Gen. Abdel-Fatah el-Sissi, chant slogans against the Muslim Brotherhood and ousted President Mohammed Morsi during a rally in Tahrir Square in Cairo, July 26, 2013.

A Morsi supporter shows tear gas shells after clashes with security forces at Nasr City, July 27, 2013.

Morsi supporters block the street with a burning tree limb during clashes with riot police at Nasr City in Cairo, July 26, 2013.

Supporters of Egypt's top military officer, Gen. Abdel-Fatah el-Sissi rally in Tahrir Square in Cairo, July 26, 2013.

Supporters of Egypt's ousted President Mohammed Morsi attend Friday prayer during a protest at Nasr City, where protesters have installed their camp and hold their daily rallies, in Cairo, July 26, 2013.

Political allies of Egypt's military lined up behind its call for huge rallies to show support for the country's top general, Abdel-Fattah el-Sissi, pushing toward a collision with Islamist opponents who are also calling for rallies demanding the return of Mohammed Morsi, the nation's ousted president.

Read more: Egypt: Two killed in clashes in rival protests

Supporters of Egypt's top military officer, Gen. Abdel-Fatah el-Sissi march over a bridge leading to Tahrir Square in Cairo, July 26, 2013.

Egyptian prosecutors accused ousted President Mohammed Morsi of conspiring with the Palestinian militant group Hamas and murder in his 2011 escape from prison that left 14 guards dead.

The development fueled the likelihood of clashes as tens of thousands of supporters and opponents of the Islamist leader massed for rival rallies.

Demonstrators wave Egyptian flags as a military helicopter passes overhead during a protest against Egypt's ousted President Mohammed Morsi in Cairo, July 26, 2013.

Masks of deposed Egyptian President Mohammed Morsi lie on the ground during a pro-Morsi demonstration at the Rabaa al-Adweya mosque in Cairo, July 26, 2013.

Supporters and opponents of Egypt's ousted President clash in Alexandria, Egypt, July 26, 2013.

Opponents of Egypt's ousted President Mohammed Morsi chant slogans during a protest at the presidential palace in Cairo, July 26, 2013.

Morsi supporters hold pictures of the ousted president and chant slogans during a protest at Nasr City in Cairo, July 26, 2013.

An Egyptian military helicopter reflects on a glass window as it flies over the presidential palace in Cairo, July 26, 2013.

A Morsi supporter wearing a head band with Arabic writing that reads, "Sisi leave," holds pictures of the former leader during a protest at Nasr City in Cairo, July 26, 2013.