The Muslim Brotherhood is now claiming that at least 70 people were killed on Friday when security forces opened fire on a protest by supporters of deposed President Mohamed Mursi in Cairo.
And Al Jazeera's Egypt television station is reporting that 120 died and some 4,500 had been injured in the early morning violence on the fringes of a round-the-clock vigil being staged by backers of Mohamed Mursi near a Cairo mosque.
A spokesman for the Brotherhood says the bullet wounds are in the head and chest, proving the security forces were shooting to kill.
There was no immediate word from the security forces about what they thought had happened.
The violence erupted on the fringes of a round-the-clock vigil being staged by backers of Mr Mursi. His supporters filled the streets around a mosque in Cairo to condemn his removal on 3 July by the army.
Army supporters converged on Tahrir Square, a few miles away.
Earlier this week, General Abdel Fattah al-Sisi urged people to take to the streets to give the military a mandate for its intervention in removing Mr Morsi and establishing an interim government.
Mr Morsi is in detention, accused of conspiring with Hamas. He is to be questioned for an initial period of 15 days, according to a judicial order issued on Friday.
The BBC reports the order was the first official statement on Mr Morsi's judicial status since he was overthrown and placed in custody at an undisclosed location.