The official death toll from Sunday's clashes between supporters of ousted president Mohamed Morsi and security forces has risen to 53, the health ministry announced on Monday.
The violence, which lasted until close to midnight, also left 271 injured.
Deadly clashes erupted in Cairo as Morsi supporters marched towards Tahrir Square, where thousands were celebrating the 40th anniversary of the 1973 war against Israel and voicing support for the army.
The interior ministry said more than 400 Morsi supporters had been arrested on Sunday while attempting to "storm public squares."
The Muslim Brotherhood’s Freedom and Justice Party, which the deposed Islamist president headed before winning the 2012 presidential election, said it held "the commanders of the 3 July coup" - particularly army chief Abdel-Fattah El-Sisi and Interior Minister Mohamed Ibrahim - responsible for "crimes of violence" against protesters.
Morsi was removed by the military on 3 July following nationwide protests against his rule.