Alexandria criminal court has adjourned the trial of 71 members of the blacklisted Muslim Brotherhood group (MB) to February 3.
The session was delayed as one of the three judges presiding over the trial withdrew, citing uneasiness.
The defendants stand trial for killing 13 people, including a police officer, and injuring 86 in 2013.
They are also accused of joining a terrorist organization, blocking roads and possessing unlicensed firearms.