The National Alliance to Support Legitimacy has called for a new round of demonstrations on Tuesday to commemorate the ouster of president Mohamed Morsi two months ago on 3 July.
Nationwide rallies were organised on Friday by the alliance, a Muslim Brotherhood-led pro-Morsi group, with some ending in clashes with security forces.
Protests in recent weeks have seen smaller numbers than previously as pro-Brotherhood demonstrations have increasingly been met with violence by security forces. A wave of arrests of top Brotherhood figures have also taken their toll on the group’s ability to mobilise, with at least 2,000 Islamists detained since a mid-August crackdown on pro-Morsi protest camps in Cairo, during which more than 600 protesters were killed.
Egypt's health ministry said eight people were killed in Friday's clashes pitting Islamists against Morsi's opponents and security forces.
The National Alliance to Support Legitimacy called on its followers in a statement late on Sunday to press on "strongly and peacefully" with daily protests to "reclaim legitimacy and condemn the coup."
Morsi, who hails from the Brotherhood, was removed by Egypt's military in the wake of mass protests against his one-year rule. Detained by the military at a secret location since his ouster, Morsi was subsequently charged with a number of offences. On Sunday, the general prosecution referred him to court on charges of inciting the murder of protesters, in an incident that took place in December 2012. Fourteen other members of the Brotherhood are defendants in the same case, which is the first charge against Morsi to go to trial thus far.
The alliance did not announce the locations of the planned demonstrations on Tuesday, which will be held under the banner "the coup is terrorism,” but said protests would take place in all squares across the country, with press conferences expected to be held to expose the "crimes of the coup."
The Egyptian interim government, for its part, has called its crackdown on the Muslim Brotherhood and its allies a "campaign on terrorism."