The National Alliance for the Defense of Legitimacy, a coalition of largely Islamist parties and figures supportive of ousted President Mohamed Morsi, plans mass demonstrations nationwide on Friday.
Magdi Salem, a leading figure of the alliance, told Anadolu Agency they will issue a statement later tonight to specify new locations for new sit-ins.
"The alliance leaders are meeting now to discuss the latest developments and will issue a statement later on the future of the peaceful revolution against the military coup."
On Wednesday, Egyptian security forces forcibly dispersed two major protest camps for Morsi supporters in Cairo's Rabaa al-Adawiya Square and Giza's Nahda Square.
The Health Ministry has said that at least 525 people were killed in nationwide violence on Wednesday, including 202 in Rabaa al-Adawiya and 87 in Nahda Square.
However, the official death toll remains far below figures given by the National Alliance for the Defense of Legitimacy, a coalition of pro-Morsi Islamist parties and figures, which has put the number of deaths from the Rabaa sit-in alone at some 2,600.