Huge rallies by supporters and opponents of Egypt's ousted Islamist president are continuing into the night with five people killed in Alexandria.
In what is seen as a trial of strength, supporters of Mohammed Morsi filled the streets around a mosque in Cairo to condemn his removal by the army.
Army supporters converged on Tahrir Square, just a few miles away.
The detained ex-leader has been formally accused of conspiring with the Palestinian militant group Hamas.
Early on Saturday, Interior Minister Mohammed Ibrahim said the sit-in protest by Morsi supporters at the Rabaa al-Adawiya mosque in Cairo would be "brought to an end soon and in a legal manner".
He gave no details but said local residents had complained about the encampment.
Earlier this week, army chief Gen Abdel Fattah al-Sisi urged people to take to the streets to give the military a mandate for its intervention in removing Mr Morsi and establishing an interim government.
Since Mr Morsi, the country's first democratically elected president, was ousted on 3 July, dozens of people have died in clashes between his supporters and opponents.
Militants have also staged deadly attacks in the Sinai peninsula. Unconfirmed reports spoke of an attack on security forces in the town of Sheikh Zuwayid on Friday.