The Muslim Brotherhood is the best-organised political movement in the most influential country in the Arab world. But what do they do next?
The Muslim Brotherhood tells ITV News they are against violence but will "pay the price of their blood" to restore their ousted president.
Egypt's army has named two further officials in the transitional government as its supporters and opponents vowed to stay on the streets.
Egypt's former leader Hosni Mubarak is likely to walk free within a week having faced the prospect of execution just weeks ago.
Mr Mubarak's lawyer confirmed to ITV News that all charges had been dropped, although he refused to appear on camera.
The news emerged as it was announced that the country's first democratically-elected but now deposed president, Mohamed Morsi, could face new charges.
ITV News International Correspondent John Irvine reports from Cairo:
Egypt's prosecutor has ordered the ousted president Mohamed Morsi to be detained for 15 days pending an investigation into allegations he incited violence, ITV News' Middle East News Editor Lutfi Abu-Aun reports.
On Thursday, Egyptian judicial authorities extended Morsi's detention period for 30 days in a separate case.
He is currently being held at an undisclosed location on allegations of murder and spying.
Clashes have broken out in central Cairo after supporters of ousted President Mohamed Morsi came under attack as they marched to the Interior Ministry, Reuters reported.
Supporters of the new military-installed government reportedly hurled stones at the marchers and threw bottles at them from balconies.
Police in turn then fired tear-gas canisters at the pro-Morsi demonstrators.
Egyptian authorities have postponed a move to force out supporters from the ousted president Mohamed Morsi from two protest camps to "avoid bloodshed" in the capital Cairo.
An official, quoted by the Associated Press, said the plan to disperse two sit-ins was shelved after it was leaked to the media.
A dawn advance by security forces would have set the stage for clashes with thousands gathered in support of Mr Morsi, who was ousted in a July 3 coup.
Followers of ousted President Mohamed Morsi have continued to make their vast presence known in the Egyptian capital despite the threat of removal.
Thousands of supporters of ousted President Mohamed Morsi continued to gather in protest camps in Cairo overnight, despite threats to forcibly remove them.
On Sunday, a senior security source told Reuters troops will be deployed around the sit-ins by dawn "as a start of procedures that will eventually lead to a dispersal".
Members of the Muslim Brotherhood and supporters of deposed Egyptian President Mohamed Morsi continue to gather in Cairo despite threats of removal.
Egyptian police are expected to start taking action early today, according to security and government sources.
Egyptian police are expected to start taking action early on Monday against supporters of deposed President Mohamed Morsi who are gathered in protest camps in Cairo, security and government sources said.
Any move against the camps, which are the main flashpoints in the confrontation between the army and Morsi supporters, could trigger more bloodshed.
The head of al-Qaeda, Ayman al-Zawahiri has reportedly issued an audio message in which he accuses the United States of plotting the overthrow of Egypt's first Islamist president Mohamed Morsi.
CNN reported the 14-minute message, the apparent first to address Mr Morsi's ousting last month, was posted to Jihadist forums yesterday.
Al-Zawahiri is quoted as saying: "The crusaders, the seculars, the Americanised army, (former President Hosni) Mubarak's thugs and some members of Islamic parties with the support of Gulf money and American plotting, all agreed to topple Mohamed Morsi's government."
In a phone call with Egyptian vice president for foreign affairs, Mr Hague stressed the need for dialogue and reconciliation between all political parties including Mr Morsi's Muslim Brotherhood.
The Foreign Secretary also condemned the excessive use of force by security services as well as attacks against them.
Mr Hague said: "We want to see a peaceful resolution that will bring an urgent end to the current bloodshed. In my view, this should involve a process of dialogue and reconciliation between all political parties in Egypt, including the Muslim Brotherhood.
"I also called for the release of all political detainees, including President Morsi, unless there are criminal charges to be made against them, and emphasised that it is vital that any charges are not politically motivated."