A spokesperson for the Muslim Brotherhood announced a 'Friday of Anger' across all Egyptian mosques
Al-Azhar Grand Sheikh Ahmed al-Tayyeb said he was only informed about the dispersal of the sit-ins through the media.
'Informal discussions' of the current violence in Egypt will take place at the request of France, the UK and Australia.
Violence by Morsi supporters leaves dozens of Christian churches, Coptic-owned businesses and properties burnt.
A number of leaders of Egypt's Muslim Brotherhood were arrested on Wednesday, an official said, after security stormed pro-Morsy sit-ins.
German FM calls Egypt's political forces 'to return immediately and avert an escalation of violence'.
EU says 'violence won't lead to any solution' in Egypt.
Turkey's President said action by Egyptian security forces against protesters in Cairo supporting ousted president Mohamed Morsi was "completely unacceptable".
Iran condemned what it called a "massacre" in Egypt as police moved on Wednesday to clear protests in Cairo by supporters of ousted president Mohamed Morsi.
Britain on Wednesday condemned the use of force by Egyptian police to clear two protest camps set up in Cairo by supporters of ousted president Mohamed Morsi.