Thousands of Egyptians held demonstrations on Monday to mark the second anniversary of former president Hosni Mubarak's ouster, with security forces imposing tight measures around government buildings, DPA reported.
Hundreds marched to central Cairo's Tahrir Square, carrying posters reading "Bread, Freedom, Social Justice" and "Leave."
The slogans were used during the 18-day revolt that forced Mubarak out of power two years ago, when tens of thousands poured onto the streets.
Protesters accuse President Mohamed Morsi of failing to meet the demands of the revolution.
The opposition also accuse Morsi of tightening his Muslim Brotherhood group's grip on power and failing to stop police abuses.
Islamists charge that the opposition is seeking to unseat Egypt's first democratically elected president.
Another march was held in the coastal city of Alexandria, which in recent months has witnessed clashes between Morsi's supporters and opponents.
Footage on local televisions showed demonstrators carrying pictures of some of those killed in clashes over the past two years.
Police forces boosted their presence around the presidential palace, after threats by the radical group Black Bloc to storm the complex in north-eastern Cairo.
Deadly clashes between protesters and police forces have taken place around the palace over the past two weeks, as demonstrators threw fireworks and petrol bombs inside the walls of the complex.
A group of people Monday briefly blocked trains by standing on the tracks at a central Cairo subway station. They left after some passengers tried to stop them, and headed to one of Cairo's main bridges, blocking cars.
Protesters also banned people from entering a main administrative building overlooking Tahrir Square for the second day running.