Cites "disturbing trend" of growing restrictions on freedom of expression.
Charged with allegedly insulting Islam and the country's embattled president Mohammed Morsi.
Protests come after court rules that Talaat Abdullah's appointment by Morsi was illegal.
Accused groups of teaming up with remnants of Mubarak regime to sow unrest and violence.
Marks the nation's emergence as a key player in Middle Eastern politics since the Arab Spring.
Prosecutor also issued summons for a sixth activist, Nawara Negm, daughter of Egypt's best known satirical poet.
Anger at charges of beatings, power-grabbing sparked most violent demonstration yet on group's doorstep.
Group ready to hand over members for questioning on March 16 assault on activists, reporters.
Gamaa Islamiya, a jihadist sect that has joined political life, setting up a local police force that has unleashed a spiral of tension in religiously diverse territory.
Spoke ahead of prayers at Cairo-based security camp.Blouin World: Egypt prosecutor calls for citizen arrests