An Egyptian court reviewed on Sunday allegations brought against six Muslim Brotherhood members, including the group's leader, that they killed protesters by their Cairo headquarters in Mukattam earlier this year.
Violent confrontations broke out by the Cairo office on June 30, killing at least 12 people.
The defendants are the Brotherhood's supreme guide, Mohamed Badie, businessman Khairat al-Shater, Mohamed Bayoumi, Mostafa al-Bashlawi, Mohamed al-Bashlawi and Atef Abdel Galil.
All the defendants but one are currently placed under custody.
The prosecutor also accused Badie, Shater and Bayoumi of inciting violence and facilitating unknown assailants in their murder and attempted murder of protesters and the illegal possession of arms.