President Mohamed Morsi appealed for calm after seven people died in clashes between police and protesters Friday, the second anniversary of the revolt that toppled Hosni Mubarak.
Morsi, "urges citizens to adhere to the values of the revolution, express opinions freely and peacefully and renounce violence," said a message posted on his Twitter account.
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The latest toll from the health ministry says seven people died in Friday's protest against the government: six in Suez and one in Ismailiya, in the northeast. It said 456 people had been injured in the unrest.
Morsi blamed the violence on criminals and said they would be tracked down and brought to justice.