The Freedom and Justice Party (FJP) – the Muslim Brotherhood's political wing – condemned a knife attack on Constitution Party's spokesman Khaled Dawoud, one of the Brotherhood's staunch critics.
"The party stresses that it is against any act of violence even if it is against those who supported the coup d'etat," reads a statement that was posted on the FJP Facebook page hours after the incident on Friday.
Dawoud, a former spokesman for the anti-Morsi bloc the National Salvation Front (NSF), was stabbed in his chest and hand on Friday in central Cairo.
Shortly after the assault, Dawoud told Al-Ahram’s Arabic news website that he was attacked by protesters while driving his car down Qasr Al-Aini Street in front of Abou Al-Rish Bridge.
He said his car was attacked and protesters pulled him out of the vehicle, beat him and stabbed him with a knife.
The liberal Constitution Party, for its part, blamed the attack on protesters from the Muslim Brotherhood, who were present in Qasr Al-Aini after a failed attempt to enter Tahrir Square.
On Friday, protests were held by loyalists of deposed president Mohamed Morsi, who hails from the Brotherhood, in Cairo but failed to reach key locations, including Tahrir Square and the presidential palace amid stiff opposition from security forces and local residents.
One protester was killed in clashes between supporters of Morsi and local residents in Manial in central Cairo. Other confrontations also erupted later between supporters and opponents of Morsi in Ibn Sandr Square in the suburb of Zeitoun, western Cairo, leaving three more dead.
Dawoud, a staunch opponent of Morsi and the Muslim Brotherhood, resigned from the NSF in mid-August to protest the group's support for the forcible dispersal of two large protest camps established by supporters of Morsi.
The dispersal by the security forces left hundreds of protesters dead.