An Egyptian court has sentenced 21 people to death for planning attacks and weapons possession.
Just five of the defendants sentenced to death were present at the trial, and they may appeal the ruling.
The remaining 16 were tried in absentia and could have a retrial if arrested.
The court also jailed four defendants to 25 years in prison each and three to 15 years.
Those sentenced had been arrested in 2015.
They been accused of planning attacks and embracing "extremist ideology."
Egyptian courts have sentenced hundreds of people to death for violence after the military toppled the Islamist president Mohamed Morsi in 2013 and unleashed a crackdown on his supporters.
Many have appealed and won retrials, but at least 19 people have been executed since December.
With Egypt facing an insurgency by the so-called Islamic State group in the Sinai Peninsula, President Abdel Fattah al-Sisi has ordered the military to clear the region of Islamist militants ahead of next month's presidential election.
