The Cairo Criminal Court sentenced six defendants to death by hanging and sentenced to 25 years imprisonment on 41 others in the case known as the PRC in Kerdasa years ago.
The same court also sentenced seven defendants to 15 years imprisonment, three years imprisonment for one defendant, the expiry of the criminal case for the defendant, and the acquittal of 14 others.
The verdict issued on Monday is a preliminary ruling in Egypt, where defendants can appeal it to the Court of Cassation, which can accept the defendants' appeal.
Egypt's official news agency said the court had unanimously ruled that, after the mufti's opinion, the six defendants, who could appeal to the Court of Cassation, were executed 60 days after the verdict was handed down.
The six defendants were convicted on charges including forming a terrorist cell aimed at attacking state institutions, possessing firearms and ammunition, killing three people, including a policeman, and disturbing public order, but denying all the charges.
The Cairo Criminal Court had decided in late May to refer the papers of the six sentenced to death to the mufti, whose opinion is advisory to the court.
Death sentences continue to be handed down and carried out in cases related to the turbulent situation in Egypt after the military coup of 3 July 2013, despite condemnations from international human rights and political circles.
Since March 7, 2015, the Egyptian authorities have carried out death sentences for 42 people, and dozens more are awaiting execution.
Egyptian opponents say those executed or awaiting execution include detainees who have been forcibly hidden and tortured to confess to crimes they did not commit.