More than 30 people were killed and more than 1,000 injured in Friday's violence following the ousting of Egypt's President Mohammed Morsi, it has emerged.
At least 12 died in Alexandria, and eight in two separate clashes in Cairo, the Health Ministry said.
The army removed Mr Morsi from power on Wednesday after millions of people protested over his leadership.
Mr Morsi, Egypt's first freely elected leader, is in detention.
Some senior figures of his Muslim Brotherhood movement have also been held.
(info from BBC News Middle East)
Supporters of Egypt's Islamist President Mohammed Morsi chant slogans during a rally, in Nasser City, Cairo, Egypt, Thursday, July 4, 2013. The chief justice of Egypt's Supreme Constitutional Court was sworn in Thursday as the nation's interim president, taking over hours after the military ousted the Islamist President Mohammed Morsi. Adly Mansour took the oath of office at the Nile-side Constitutional Court in a ceremony broadcast live on state television. According to military decree, Mansour will serve as Egypt's interim leader until a new president is elected. A date for that vote has yet to be set. Arabic reads, "the people support legitimacy for the president,". (AP Photo/Hassan Ammar)