Hashem Abedi has been found guilty of attacking a prison officer at HMP Belmarsh.
Abedi, who plotted the Manchester Arena terror attack alongside his brother, suicide bomber Salman Abedi, has been convicted alongside two other terrorists.
Parsons Green Tube bomber Ahmed Hassan, 22, and Muhammed Saeed, 23, who spoke about carrying out a knife attack in London, were also found guilty.
The attack took place in Belmarsh’s high security unit on May 11, 2020.
Prison officer Paul Edwards, 57, was hit with a chair and repeatedly punched and kicked by Abedi, Hassan and Saeed.
All three prisoners denied assault causing actual bodily harm (ABH) to Mr Edwards but were found guilty at Woolwich Crown Court today by a jury after around three-and-a-half hours of deliberations.
Abedi was also found guilty of assault by beating of an emergency worker after kicking prison officer Nick Barnett as he came to his colleague’s aid.
Mrs Justice Cheema-Grubb said she will sentence them later on Tuesday. Read the full sentencing report here.
Hashem Abedi is currently serving a minimum of 55 years in prison for the murders of the 22 Manchester Arena victims.