The casualty figures were released by Muslim Brotherhood and Egyptian medical sources.
Al Jazeera’s Egypt television station reported that 120 had been killed and some 4,500 injured in the early morning violence. A Reuters reporter at the scene counted 36 bodies at an improvised morgue.
Gehad El-Haddad, the Muslim Brotherhood spokesman, said the shooting started shortly before pre-dawn morning prayers on the fringes of the vigil being staged by backers of Morsi.
“They are not shooting to wound, they are shooting to kill,” Haddad said.
Thousands of supporters and opponents of the army’s removal of Morsi also took to the streets of the Mediterranean city of Alexandria, sparking fierce clashes that killed seven people and wounded 194.
A group of people who were trapped by armed men in one of the city’s main mosques have been released, but 70 remain inside, including women and children.
Reports say the clashes between Morsi’s supporters and opponents continue to rage, resulting in rising casualties.
Since President Morsi was removed from office by the military on July 3, dozens of people have died in mass protests. In some of the worst violence since the unrest began in Egypt, 50 Morsi supporters were gunned down at a Cairo barracks on July 8 by security forces.