Hundreds of demonstrators have been staging a sit-in in Cairo's Tahrir Square as protests continue over the verdicts in the trial of Egypt's ousted president Hosni Mubarak.
The 84-year-old was sentenced to life in prison for his complicity in the killing of hundreds of people during last year's uprising, but four of his security chiefs and his two sons were acquitted - prompting widespread anger .
Mubarak, who appeared in court on a hospital stretcher during the nine-month trial , was given a life sentence on Saturday for his involvement in the killing of protesters during last year's uprising that toppled him from power.
Around 850 demonstrators were killed, most shot to death, in Cairo and other major cities across the country in 18-days of nationwide protests in 2011.
Sentencing Mubarak, Judge Ahmed Rifaat described the former leader's era as "30 years of darkness" which only ended when Egyptians rose up to demand change from the "tyranny and corruption".
"The people of Egypt woke on Tuesday, January 25, to a new dawn, hoping that they would be able to breathe fresh air... after 30 years of deep, deep, deep darkness," he told the court.
In the hours after the verdicts, tens of thousands joined demonstrations in the capital and in the second city Alexandria, declaring the trial a sham and calling for a "continuation of the revolution".
The Muslim Brotherhood urged its supporters to join the protests, seeking to capitalise on the explosion of fury against the old regime ahead of this month's presidential run-off vote.
The Islamist movement's candidate, Mohamed Morsi, is competing against Mubarak's former prime minister, Ahmed Shafiq, in the final stage of the election in a fortnight.
Groups of protesters attacked Mr Shafiq's campaign offices in two provincial towns, but most of the demonstrations were largely peaceful with the security forces staying well out of sight.
The attack on the office of Mr Shafiq is the second such incident in a week .
The run-off election has polarised Egypt, with many moderate Egyptians wary of both candidates, fearing both Islamic rule and a possible return to the repression of the old regime.
The Muslim Brotherhood is hoping to win over the doubters, including young liberal revolutionaries, by portraying itself as the only movement in Egypt that will deliver real change and justice.
Mr Morsi toured Tahrir Square late on Saturday pledging new prosecutions against security officials if he is elected.
"We will keep the revolution going until it realises its aims," he said.