At least 1,915 people have been detained, the Egyptian Center for Economic and Social Rights said. The general prosecutor announced that about 1,000 are being questioned for attending earlier protests.
Egypt holds a three-day referendum from Saturday on constitutional amendments that could allow President Abdel Fattah al-Sisi to stay in office until 2030. What are these amendments? Who is behind them?
Abdel-Fattah El-Sisi's election brought to an end the one-year chairmanship of Rwanda's President Paul Kagame. African Union chairmen set agendas of issues to be addressed during their one-year tenure.
Army and security troops were deployed across the country to secure the polling stations, while delegates of the two presidential candidates are employed in the polling stations to ensure the safety of ballot boxes.
The meeting came just days after Egypt helped broker an agreement with the Palestinian Hamas group to dissolve the administration that runs Gaza and hold talks with Abbas' Fatah movement, its Palestinian rivals.
The Egyptian president joined Prime Minister Benjamin Netanyahu for talks with then US secretary of state John Kerry hosted by King Abdullah II in the Jordanian city of Aqaba in February 2016, a former US official confirmed to AFP earlier this year.