Ousted president Mohamed Morsy has been given a further 30 days' detention on Friday pending investigations into charges of involvement in prison breaks during the 2011 uprising, as well as espionage.
Morsy is accused of plotting with Palestinian faction Hamas, a Muslim Brotherhood ally, for his escape from Wadi al-Natroun prison during the 2011 uprising.
Other charges posed against Morsy include collusion with Hamas for attacking police facilities, freeing prisoners, killing and kidnapping soldiers
The same court extended the detention of Morsy's former chief of staff, Mohamed Refaa al-Tahtawy, for 30 days over charges of espionage for the Palestinian group by providing it with information during his time in office.
Hamas has occasionally denied interference with Egypt's domestic affairs, accusing its critics in Egypt of trying to demonize it.
The judges ordered other suspects to be interrogated. There are already 13 suspects in the case. Accounts by 30 witnesses have been heard and reports by the National Security Authority had been received.
Judge Hassan Samir said a media gag on the case remains in force until results are announced to the public at the end of investigations.