Several thousand demonstrators have gathered on Cairo's Tahrir Square to protest the continued political influence of the military and figures from the regime of longtime Egyptian strongman Hosni Mubarak.
The Muslim Brotherhood, which dominates both houses of the country's parliament, backed the protests after its candidate for the May presidential election was disqualified from running by the election-oversight committee.
Other demonstrators supported the disqualified Salafist candidate.
Demonstrators also voiced concern that the election might be postponed because a court suspended a commission charged with writing a new constitution earlier this month.
The Supreme Council of the Armed Forces has said that the constitution must be adopted before the vote.
The military has run the government since Mubarak's February 2011 resignation, but has promised to hand over power to a civilian administration.
Based on reporting by AFP and dpa