The trial of Islamist militant Adel Habara and 34 other defendants was adjourned on Tuesday to 22 June, Al-Ahram's Arabic website reported.
The defendants are accused of involvement in the execution-style killing of 25 policemen in an ambush in the Sinai Peninsula in August of last year.
The killings were among the deadliest of attacks following the ouster of Islamist president Mohamed Morsi in July 2013.
The defendants are accused of carrying out terrorist crimes in the unruly peninsula – scene of a growing Islamist insurgency – and in the capital Cairo, as well as conspiring with the militant group Al-Qaeda in Iraq.
Since the ouster of Morsi, more than 500 security personnel have been killed in militant attacks.