Egypt's April 6 Youth Movement has demanded that the interior minister resign, condemning Saturday's violent clashes in Cairo's Nasr City district that left dozens dead.
In a statement released on Sunday, the movement denounced "violence and terrorism from police and pro-Morsi protesters" and has called on all factions to not give an "official or popular cover" to violent actions.
It also held the minister responsible for the bloodshed since deposed president Mohamed Morsi was in power when deadly clashes erupted between his supporters and opponents.
Interior Minister Mohamed Ibrahim, appointed by Morsi, has remained in his post in Egypt's interim cabinet following Morsi's ouster on 3 July.
April 6 called on interim President Adly Mansour and the government to form a fact-finding committee to investigate "the reasons for using excessive force" in dispersing protesters at the Memorial of the Unknown Soldier in Nasr City.
However, it also demanded that leaders of the Muslim Brotherhood, from which Morsi hails, "who incite violence" be arrested to stand before the court.
Violence erupted in the early hours of Saturday at the Memorial, located near Rabaa Al-Adawiya Mosque, the site of an ongoing large pro-Morsi sit-in, when police clashed with protesters seeking to block the nearby 6 October Bridge.
According to latest tolls of Egypt's health ministry, 84 people were killed in Saturday's violence. However, Brotherhood spokesman Ahmed Aref said 66 people were killed and another 61 were on life support machines.
He told reporters on Saturday that more than 4,000 were wounded by teargas and bullet or birdshot wounds.
The makeshift field hospital at Rabaa Al-Adawiya counted more than 100 people dead.
The police claimed that pro-Morsi protesters clashed with residents of the nearby Mansheyet Nasser working-class district. The police also denied it shot any live ammunition, saying it only used teargas.
However, the Brotherhood said that the police used excessive live fire against their protesters.