Following the overthrowing and subsequent arrest of their President, Egyptian generals have launched a search-and-detain campaign of senior figures in the Muslim Brotherhood, of which the ousted president was a member.
In the wake of the coup d'état, the army sworn the top judge of Egypt's Constitutional Court, Adly Mahmud Mansour, as interim leader.
He has pledged to hold elections based on "the genuine people's will".
However, according to BBC, senior figures in the Muslim Brotherhood and its political segment, the Freedom and Justice Party (FJP), were quoted as saying they would not work with the new powers - but would not take up arms or encourage followers to do so either.
The unrest happened after days of mass rallies against President Morsi and his political party.
About 50 people have died since the latest upheaval started on Sunday, and reports point that there are fears of confrontation between the pro- and anti-Morsi blocks keep mounting.
To counter the generals, a coalition of Islamist parties - the National Coalition in Support of Legitimacy - is rallying the masses to denounce the army's actions following prayers on Friday.
"Morsi was put under house arrest and the entire presidential team was in detention," said Gehad el-Haddad, a spokesman for the Muslim Brotherhood said in a interview to BBC.
In other hand, the generals justify their action by claiming that Morsi, and his first Egyptian freely elected administration, failed to meet the demands of the people.
According to BBC News, Haddad's father, senior Morsi aide Essam el-Haddad, and Saad al-Katatni, head of the FJP, are among those under arrest.
And according to reports that emerged on Thursday afternoon, Mohammed Badie, supreme leader of the Brotherhood, had been arrested in Marsa Matrouh, a Mediterranean coastal city to the west of Cairo. And there are reportedly arrest warrants issued for some 300 other members of the Muslim Brotherhood, including Mr Badie's deputy, Khairat al-Shater.