An Egyptian court handed death sentences to more than 500 supporters of the country's ousted president on Monday, lawyers said.
The 529 members of the Muslim Brotherhood were accused of a deadly attack targeting police in Cairo last August.
The ruling was described by Cairo-based rights lawyer Mohammed Zarie as "way over the top and unacceptable."
"It turns the judiciary in Egypt from a tool for achieving justice to an instrument for taking revenge," Zarie told the AP.Muslim Brotherhood supporters protest in Cair, Egypt, in February.
The Muslim Brotherhood was classified as a terrorist organization by Egypt's military government after its former leader, President Mohammed Morsi, was deposed and arrested last year.
The charges relate to violence in Cairo in August, which resulted in one police officer being killed. The riot was a backlash against a police crackdown on two pro-Morsi sit-in protests on Aug. 14.
Only 123 of the defendants were present at the hearing, the rest were either released, out on bail or on the run.
Hundreds of Muslim Brotherhood members have been killed in clashes with police and thousands more arrested since Morsi was overthrown.
Monday's ruling came the same day as a group of Al Jazeera journalists were due to begin their trial in Cairo on being associated with the Brotherhood.
The Associated Press and Reuters contributed to this report.