Three Egyptians have been killed during clashes between supporters and opponents of deposed President Mohammed Mursi.
Thousands rallied in Egyptian cities demanding the reinstatement of the Islamist leader.
Two women and a 13-year-old boy were killed and eight others were injured, including one in critical condition.
The clashes erupted in the Nile Delta town of Mansoura.
At least 99 people have died in violence since Mursi's removal by the army on 3 July.
More than half of them died when troops fired on Islamist protesters outside a Cairo barracks on 8 July.
Seven people died earlier this week in clashes between opposing camps.
Egyptian armed forces put on a show of force in the hazy skies above Cairo.
Eight fighter jets screamed over the city in the morning and afternoon, while two formations of helicopters, some trailing the Egyptian flag, hummed over the rooftops.
Early this morning, army helicopters were seen dropping Egyptian flags on thousands of Mursi's opponents gathering in Cairo's central Tahrir Square.
Waving their own Egyptian flags, along with portraits of the bearded Mr Mursi, members of the Muslim Brotherhood marched in Cairo, Alexandria and several other cities along the Nile Delta, denouncing what they termed a military coup.
Soldiers prevented protesters from nearing army installations, and there were reports of minor scuffles.
Troops fired teargas to disperse demonstrators close to the presidential palace in Cairo.
The army has dismissed any talk of a coup, saying it had to intervene after vast protests on 30 June against Mr Mursi, denounced by his many critics as incompetent and partisan after just a year in office.
It has called for a new constitution and a swift new vote.
The army installed an interim Cabinet that includes no members of the Brotherhood or other Islamist parties that triumphed in a string of elections following the fall of Hosni Mubarak in 2011.