Supporters of ousted President Mohamed Morsi have massed for further protests to demand the army restore Egypt's first democratically elected leader, after almost 24 hours of violence that has killed at least 37 people.
The atmosphere was tense on Saturday as interim leader Adly Mansour held talks with ministers, aides and the Tamarod opposition group that engineered the mass demonstrations culminating in the ouster of Morsi.
Opposition leader Mohamed ElBaradei was to be named the interim prime minister later on Saturday, a source close to Mansour said.
Crowds were swelling late afternoon outside Cairo's Rabaa al-Adawiya mosque in Nasr City, where Morsi supporters have been camped out for the past 10 days. Morsi supporters also gathered for a sit-in outside the Republican Guards building where the ousted president is believed to be held.
The nearby 6th October bridge over the Nile River was still littered with rocks and burned out tyres from the overnight deadly confrontations.
Anti-Morsi protesters meanwhile, have set up checkpoints in Cairo's Tahrir Square after a night of deadly fighting nearby.
Al Jazeera's Sherine Tadros, reporting from Cairo, said that the Freedom and Justice Party, the political arm of the Muslim Brotherhood declined to attend the meetings to discuss a new government.
"On the one hand you have the interim president Adly Mansour aggressively trying to push forward this political transition - the so-called roadmap - by meeting with these political factions to try to form a coalition government that will not exclude anyone." Tadros said.
"On the other hand you have the protests taking place by supporters of Mohamed Morsi. And they're saying that they will stay on the streets to demonstrate until the deposed president is reinstated. So they are not taking party in these meetings," she added.
A coalition of Islamist groups early on Saturday vowed "civilised protests and peaceful sit-ins in Cairo until the military coup is reversed and the legitimate president is restored".
Despite the talk of peaceful demonstrations, residents of a Cairo district reported that Morsi supporters armed with machine guns, machetes and sticks clashed with them as they passed through their area during the night.
'Preventively detained'
Army chief General Abdel Fattah al-Sisi announced Morsi's overthrow on Wednesday night, citing his inability to end a deepening political crisis.
The Islamists accuse the military of conducting a brazen coup, after protesters called for Morsi's ouster on the June 30 anniversary of his maiden year in power.
The interim president issued his first decree on Friday, dissolving the Islamist-led parliament and appointing a new intelligence chief.
Morsi is being "preventively detained", a senior military officer told AFP.
A judicial source said the prosecution would on Monday begin questioning Brotherhood members, including Morsi, for "insulting the judiciary".
Coincidentally, ex-president Hosni Mubarak, toppled in a popular uprising that led to the poll in which Morsi was elected new leader, appeared in court in Cairo on Saturday when his retrial for alleged complicity in the killings of protesters in 2011 resumed.
The 85-year-old former president appeared in the dock behind bars on Saturday, wearing dark sunglasses and a white prison uniform.
During the televised hearing, Cairo's criminal court heard submissions by the defence before adjourning proceedings until August 17.
PHOTO CAPTION
A poster of deposed Egypt's President Mohamed Mursi is pictured as security personnel (rear) keep watch over a protest by supporters of Mursi outside the Republican Guard barracks where Mursi is held in Cairo July 5, 2013.
Al-Jazeera