One dead in anti-Morsi clashes
Today's marches took place despite an intervention by Ahmed al-Tayyeb, head of the 1,000-year-old al-Azhar university and mosque, who hauled in politicians for crisis talks yesterday where they signed a charter disavowing violence. Mr Morsi's foes said the pact did not require them to call off demonstrations.
"We brought down the Mubarak regime with a peaceful revolution and are determined to realise the same goals in the same way, regardless of the sacrifices or the barbaric oppression," tweeted Mohamed ElBaradei, a former head of the UN nuclear watchdog who has become a secularist leader.
The main opposition National Salvation Front denied it was to blame for the demonstrations turning violent. Mr Morsi's office said it would "hold the political forces that may have participated in incitement fully politically responsible, pending results of investigation."
Tahrir Square, ground zero of the uprising against Mubarak, has become a graffiti-scarred monument to Egypt's perpetual turmoil, strewn with barbed wire and burnt-out cars. Vendors sold flag bracelets, pharaonic statues, sunflower seeds, water and fruit while the protesters gathered.
A man with a microphone shouted to the crowd, calling for Mr Morsi to be put on trial. "We came here to get rid of Morsi," said furniture dealer Mohammed al-Nourashi (57).
The rise of an elected Islamist after nearly 60 years of rule by secular military men in the most populous Arab state is the most important change achieved by two years of Arab revolts.
But seven months since his narrow election victory over an ex-Air Force commander, Mr Morsi has failed to unite Egyptians and protests have made the country seem all but ungovernable. The turmoil has worsened an economic crisis, forcing Cairo to drain its currency reserves to prop up its pound.
Brotherhood leader Mohamed Badie, on his Facebook page, blamed the unrest on "regional and international forces which aim for instability and to stir up problems and ignite strife to damage Egypt ... to thwart the democratic transition".
Brotherhood followers have clashed with demonstrators in the past, especially at the presidential palace which they regard as a symbol of his legitimacy. But the group has kept its men off the streets during the latest violence.
It is far from clear that opposition politicians could call off the street demonstrations, even if they wanted to.
"You have groups who clearly just want a confrontation with the state - straightforward anarchy; you've got people who supported the original ideals of the revolution and feel those ideals have been betrayed," said a diplomat. "And then you have elements of the old regime who have it in their interests to foster insecurity and instability. It is an unhealthy alliance."
Many Egyptians are fed up.
"We are exhausted. This protests thing is a political game whose price the people are paying. I hate them all - liberals and Brotherhood," said Abdel Halim Adel (60) near the presidential palace.