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A presidential spokesman denied Saturday that political liberal and Nobel Peace Prize laureate Mohammed ElBaradei had been named Egypt's new prime minster, as official news agency Mena had reported earlier.
The spokesman said interim President Adli Mansour was still holding consultations and that ElBaradei was one of the candidates.
A spokesman for the ElBaradei-coordinated National Salvation Front, the country's leading non-Islamist political alliance, had told Efe earlier Saturday that ElBaradei was to be sworn in Saturday night at the presidential palace in Cairo.
ElBaradei's name has been mentioned as a possible successor to Hisham Qandil, an Islamist who was in office until Wednesday's coup that deposed President Mohammed Morsi.
Morsi's Muslim Brotherhood movement said in a statement that it would not accept ElBaradei as the country's new head of government.
In a statement on its Web site, the MB said it considered the announced appointment of ElBaradei as a "prize" for his "role in planning the coup" that ousted Morsi.
At least 35 people were killed and 1,400 others were wounded during violent clashes in different parts of Egypt on Friday, when supporters and opponents of Morsi held rival mass demonstrations.
At least four people were killed outside the headquarters of the Republican Guard in Cairo, where Islamist protesters believe Morsi is being held, according to the Attorney General's Office.
Calm was restored on Saturday but tensions were still running high.
Morsi's Islamist supporters have held protests since the coup, when the armed forces suspended the constitution that he enacted during his abbreviated term in office and named Mansour, the head of the Supreme Constitutional Court, as interim head of state pending fresh elections.
The military acted following days of massive anti-government protests.
Critics accused Morsi and the Brotherhood of doing little to address poverty and Egypt's struggling economy, of failing to advance the goals of the 2011 revolution that forced out strongman Hosni Mubarak and of seeking to monopolize power.
In a statement earlier Saturday, the MB demanded the punishment of security forces responsible for "murdering demonstrators, arresting political leaders and shuttering satellite television channels."
Among the MB leaders arrested in recent days is the group's No. 2, Khairat El-Shater, who was detained Friday for allegedly inciting his followers to kill rival demonstrators.
Authorities also ordered the arrest of the Brotherhood's top leader, General Guide Mohammed Badie, although he was seen in public Friday speaking to a large crowd of Islamists who had gathered at a Cairo square to show their support for Morsi. EFE