Three Egyptians have been killed in clashes between opponents and supporters of deposed President Muhammad Morsi.
Two women and a boy were killed and eight others wounded in the clashes late on July 19 in the Nile Delta town of Mansoura.
The violence comes after thousands rallied in Egyptian cities demanding the reinstatement of the Islamist leader.
Early on July 20, army helicopters were seen dropping Egyptian flags on thousands of Morsi's opponents gathering in Cairo's central Tahrir Square.
Morsi is being held in an undisclosed location by the army, and numerous senior Muslim Brotherhood leaders have also been detained in recent days, leading to fears of a broad crackdown.
The top UN human rights official, Navi Pillay, has asked the new Egyptian government to explain both the legal basis for the detentions and to say whether trials were planned.
Based on reporting by Reuters and AP