Clashes resumed in Cairo on Saturday between police and demonstrators trying to occupy Tahrir Square in protest at authoritarian new powers seized by President Mohammed Morsi.
Police fired tear gas, as they had on Friday evening as protesters hurled stones and set a school near the interior ministry on fire.
Mr Morsi was unrepentant over his move to make his decisions unchallengeable in the courts – a ruling announced on Thursday in the wake of his success in negotiating a ceasefire deal between Hamas and Israel. His Muslim Brotherhood backers called for a mass rally in his support on Tuesday.
But he came under pressure from Egypt's judges, who were sidelined in the declaration. Mr Morsi stopped all further legal challenges to the committee drawing up a new constitution, sacked the prosecutor-general, and decreed that all his own decisions were beyond challenge also until a new parliament was elected.
The Supreme Judicial Council held an emergency meeting to declare that the decision was "an unprecedented attack on the independence of the judiciary and its rulings".
Mr Morsi's declaration also came under fire from Egypt's backers in the West.