No to the" Brotherhood state" ,says Sabahi

Opposition supporters began converging on Tahrir Square on Friday morning. Some protesters have erected checkpoints to verify the identities of people passing through.

Others have set up an exhibition of photographs of those killed in protests over the past two years.

"Our dream is continuing. We reject the domination of any party over this state. We say no to the Brotherhood state," leftist leader Hamdeen Sabahi told the Reuters news agency, referring to the Muslim Brotherhood, to which Morsi belongs.

Egyptian demonstrators scatter during clashes with police, 25 January Demonstrators tried to dismantle one of the barricades blocking roads to government buildings

The roads leading from Tahrir Square to several nearby government buildings and foreign embassies have been blocked by concrete walls since last November.

Demonstrators tried to dismantle one of them on Thursday night, but a new wall was built to block entry to the Cabinet headquarters.

The unrest continued overnight. On Friday, Nile TV reported worsening clashes outside the interior ministry near Tahrir Square.

The BBC's Aleem Maqbool in Tahrir Square says there are now large numbers of protesters there, but that the violence is restricted to a small corner of it, where teenagers are throwing stones at the parliament building.

At least 25 people have been injured in clashes in Cairo since Thursday.

Smaller rallies are taking place in other cities, including Alexandria, Ismailia, Suez and Port Said.

Clashes were reported in at least two locations in Alexandria, with police firing tear gas and protesters burning tyres.

State TV showed protesters in Suez throwing stones at public buildings as motorcycles carried injured people away.

One of the demonstrators at Tahrir Square, Hanna Abu el-Ghar, told the BBC: "We are protesting against the fact that after two years of the revolution, where we asked for bread, freedom and social justice, none of our dreams have come true."

The liberal opposition accuses Morsi of being autocratic and driving through a new constitution .

Ahead of the planned rally Mohamed ElBaradei, a leading opposition figure and former head of the UN atomic agency, said is a statement: "I call on everyone to take part and go out to every place in Egypt to show that the dream must be completed."

The government is also being blamed for a deepening economic crisis.