An Egyptian judge ordered an additional 15-day detention of ousted President Mohammed Morsi on new allegations of conspiring with Hamas to break dozens of Muslim Brotherhood leaders from prison during the 2001 uprising.
Morsi has been held in an undisclosed location since his overthrow on May 3. The 15-day remand can be extended as the investigation continues.
According to Egypt's official MENA News agency, the judge's order is the interim government's first official announcement about Morsi since his arrest.
The allegations accuse Morsi of collaborating with the Gaza-based Islamist group "to carry out anti-state acts, attacking police stations, army officers and storming prisons, setting fire to one prison and enabling inmates to flee, including himself, as well as premeditated killing of officers, soldiers and prisoners."
Hamas, the Palestinian faction ruling the Gaza Strip, is an offshoot of Egypt's Muslim Brotherhood.
Meanwhile, Gen. Abdel Fattah al-Sissi is asking the Muslim Brotherhood to tone down its rhetoric.
"We are not against you so don't be against us," read a flier dropped near a mosque where Morsi supporters were gathered. "Don't raise your weapons in the face of your brothers, don't destroy, don't burn, and let us all be together against killing, violence and terror."
Sissi called on Egyptians to come out in force Friday in support of the government's crackdown against jihadists who have been attacking security forces in the Sinai. Authorities are bracing for mass demonstrations by both sides after Friday prayers.