The Manchester Arena bomber’s brother Hashem Abedi and Parsons Green bomber Ahmed Hassan have been charged with assaulting a prison officer at HMP Belmarsh.
The pair have been charged alongside a 22-year-old called Muhammed Saeed in relation to an incident on 11 May, 2020.
Abedi has also been charged with an assault on a second prison officer.
All three are due to appear at Bromley Magistrates’ Court on 7 April.
Abedi was found guilty in March of 22 counts of murder, attempted murder and plotting to cause an explosion likely to endanger life over his brother Salman’s attack on the Manchester Arena in 2017.
He was given 24 life sentences with a minimum jail term of 55 years.
Hassan planted the bomb on the Parsons Green Tube in September 2017, injuring 51 commuters.
He was given life with a minimum of 34 years in 2018.