Egypt's Rebel campaign has called for an independent investigation into what it described as the "lamentable" violence outside a Cairo military barracks early Monday in which dozens of protesters were killed in clashes with security personnel.
At least 51 were killed and 435 injured in violence between Egypt's army and supporters of toppled president Mohamed Morsi outside the Republican Guard headquarters in Cairo's Nasr City district.
The Rebel campaign, which was the driving force behind the 30 June protests culminating in Morsi's ouster, urged the president's supporters, namely the Muslim Brotherhood, "not to drag the country into a violent conflict."
In a Monday statement, the group claimed that it had adhered to peaceful protest on 30 June. It went on to blame outbreaks of violence since Morsi's ouster on the Muslim Brotherhood, the group which propelled Morsi to the presidency last year.
Running street battles between supporters and opponents of the toppled president in Cairo and other Egyptian governorates have led to dozens of deaths and injured hundreds of injuries, raising the spectre of further violence and polarisation.
Rebel also called on the pro-Morsi camp to distance itself from calls for escalation or international intervention.
The Muslim Brotherhood's Freedom and Justice Party has called for international mediation in the aftermath of recent violence, so as to "prevent more massacres" and stop Egypt from following the same route as strife-torn Syria.
Some politicians condemned the Brotherhood's call, urging leaders of the Islamist party to engage in talks with Egypt's interim administration – installed by the military following Morsi's ouster – and the armed forces to resolve the current political standoff.
The Salafist Nour Party, meanwhile, has pulled out of talks over appointments to the interim government to protest what it described as the "massacre" of pro-Morsi demonstrators on Monday morning.
Talks were already stalled before Monday's unrest, when Nour – Egypt's second biggest Islamist party – rejected the candidacy of two liberal-leaning figures for the premiership.
The Brotherhood has also said that it opposes any measures taken by the army-backed administration. The group has spearheaded protests since Morsi's overthrow to demand his reinstatement.