Egypt's military chief vows to hold firm against violence by Islamists in a speech on Sunday.
The Muslim Brotherhood has reduced its number of marches to be staged on Sunday, suggesting the change in tactics may be an attempt to reduce human losses.
Informed sources tell Ahram Online that Egypt's 2012 constitution, drafted by an Islamist-dominated Constituent Assembly, will be fundamentally changed.
The total death toll from Friday violence across Egypt has reached 173, according to Health Ministry spokesperson Mohamed Barakat.
Official spokesperson for the Muslim Brotherhood, has denied claims by presidential adviser Mostafa Hegazy that he justified assaults on Egypt's churches.
Brotherhood spokesman says bloody crackdown triggered uncontrollable anger, claims death toll eight or nine times higher than official reports.
288 of the dead were killed in Rabaa Al-Adawiya, the pro-Morsi camp in eastern Cairo.
A number of police stations and security checkpoints were attacked, leaving several police personnel dead.
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.