Several Islamist powers and figures denounced the killing of dozens of ousted President Mohamed Morsi's supporters near Rab'a al-Adaweya Square in the early hours of Saturday.
Younis Makhioun, chairman of the Salafist Nour Party, held "those in power responsible for protecting all peaceful protesters, regardless of their affiliations."
In a press release, Makhioun called for "an immediate end to these massacres, bringing those responsible to account, assigning a judge to investigate the crime, and forming a fact-finding committee to reveal the truth to the people."
Medics at a field hospital in Rab'a al-Adaweya said that at least 200 people had been killed when security forces used live ammunition against pro-Morsi demonstrators near the square.
The Health Ministry, meanwhile, says only 60 people were killed in the violence.
The Interior Ministry said the clashes erupted when pro-Morsi demonstrators attempted to block a major road and assaulted security forces.
Thousands of people took to the streets on Friday to support a request by army chief Abdel-Fattah al-Sisi, who is also Egypt's defense minister, for a "popular mandate" to "confront violence."
Amr al-Mekki, deputy leader of Nour Party, said such a mandate should not be used against peaceful protesters.
"We thought that terrorism and thuggery would be combatted, not peaceful protesters," he said.
Mohamed Hassan, spokesman for Egypt's Gamaa Islamiya group, meanwhile, held al-Sisi responsible for Saturday's violence.
"What happened was due to the coup leaders' efforts to drag the country into civil war, and we cannot find anyone responsible but the defense minister," said Hassan.
The Salafist Watan Party also slammed Saturday's violence as "a crime against unarmed, innocent civilians who were peacefully expressing their opinion."
It went on to hold all parties that supported the "military coup" responsible for the killings, a reference to Morsi's July 3 ouster by the armed forces.
Hasan al-Shafae, an adviser to Al-Azhar Grand Imam Ahmed al-Tayeb, also voiced regret over the killings, blasting local and foreign human rights groups' "silence in the face of massacre."
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