Thousands of people have been protesting in Cairo, despite a warning from Egypt's governing military council.
Activists are demanding faster political reform but the military has said parliamentary elections may have to be postponed.
The protesters dismissed an offer from Prime Minister Essam Sharaf on Monday to reshuffle his cabinet this week.
After calls for a million-man march on the cabinet office, the interim military rulers warned protesters against "harming public interests".
The BBC reports the march was called off, but thousands held an evening rally in Tahrir Square.
It is the fifth day of a sit-in in the central Cairo square - the heart of Egypt's uprising that toppled former President Hosni Mubarak in February.
Tens of thousands of people demonstrated there last Friday, calling for faster reform and for corrupt Mubarak-era officials to be brought to justice some four months after his ousting.