Egyptian security forces clashed with protesters on Friday as the vote count continued for the second round of the country’s parliamentary elections.
Demonstrators said they were angered by images posted online that show an injured man who had reportedly been beaten by police.
A sit-in outside Egypt’s Cabinet building in central Cairo is now in its third week.
Its key demand is that the military hands over to a civilian government now, rather than in June as it has promised.
The army took power when former president Hosni Mubarak was ousted by a popular revolt in February.
Elections for new parliament are being held in three stages, with nine of Egypt’s 27 governates casting ballots in each stage.
The process will be completed by January 10.
Polls suggest the Muslim Brotherhood’s Freedom and Justice party will hold on to its lead and win the most seats.