A video captured by Ahram's Arabic news website shows members of the group which clashed with the Islamist protesters on Friday using firearms.
Clashes broke out between Islamist protesters and unknown opponents near Cairo's High Court on Friday, leaving dozens injured.
Thousands of Islamist protesters were holding a rally before the High Court in downtown Cairo to demand the "purge of Egypt's judiciary" when clashes erupted.
Another video, captured by Ahram Online, showed of two men on the Islamists side using firearms.
Video by Mostafa Kashef