Hundreds of people gathered at former president Gamal Abdel-Nasser's mausoleum on Monday to mark the 60th anniversary of the 23 July Revolution.
Nasser loyalists laid flowers on his grave in the Cairo district of Hadayeq Al-Qubba.
The event turned into an anti-Muslim Brotherhood protest, with people chanting "Down with the rule of the [Brotherhood's] supreme guide" and "Abdel-Nasser said it a long time ago, the Brotherhood is not to be trusted."
Egypt's newly elected President Mohamed Morsi is a long-term member of the group, which was persecuted by the Nasser regime during the 1950s and '60s.
Nasser's son Abdel-Hakim and daughter Hoda were at the mausoleum where Nasser and his wife Tahia are buried.
Nasserist figure and former presidential candidate Hamdeen Sabbahi attended the event, as did independent MP Mostafa Bakri, former Sharqiya governor and longtime Nasserist Azzazi Ali, Reform and Development Party leader Rami Lakah and lawyers' syndicate leader Sameh Ashour.
The 1952 Free Officers Revolution overthrew Egypt's 150-year-old monarchy, and Gamal Abdel-Nasser, who was a leader of the Free Officers Movement, became Egypt's president and an Arab icon from 1954 to 1970.