Egypt's cabinet is set to discuss the crisis in the country, where hundreds have died in clashes in recent days. The interim prime minister has put forward a proposal to legally dissolve the Muslim Brotherhood.
Its members are key supporters of Mohammed Morsi, whose ousting as president sparked Egypt's stand-off.
The interim government is continuing to crack down on protests by the Brotherhood, but more demonstrations are planned around Cairo on Sunday.
Overnight, television pictures showed protesters on the streets of Egypt's second largest city, Alexandria, and in Helwan and Minya to the south of Cairo, in defiance of an overnight curfew.
On Saturday Egypt's security forces cleared the al-Fath mosque in Cairo after a long stand-off with Muslim Brotherhood supporters barricaded inside.
The confrontation at the mosque continued for most of Saturday - with exchanges of gunfire between protesters and security forces, who were cheered on by crowds outside.
The Brotherhood has called for daily demonstrations since a crackdown on its protest camps in Cairo on Wednesday left hundreds of people dead. Further clashes on Friday killed at least another 173 people across the country.
The pro-Morsi Anti-Coup Alliance announced plans for six marches in Giza, near Cairo, on Sunday. They will start at mosques after prayers at 14:00 GMT and converge on the Supreme Constitutional Court in Maadi.
Three other marches in Cairo at the same time will head towards Heliopolis, where there will be a news conference by the alliance.
