Manchester Arena bomb plotter Hashem Abedi has been charged with three counts of attempted murder after four prison officers were injured at a maximum security prison.
The 28-year-old has also been charged with assault occasioning actual bodily harm and unauthorised possession of a knife or offensive weapon after the incident at HMP Frankland in Durham on April 12.
Abedi was jailed for a minimum of 55 years in 2020 for helping to plan the suicide bombing at the 2017 Manchester Arena bombing.
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He has been housed in a separation unit at the County Durham jail.
Counter Terrorism Policing North East said it had carried out a “thorough investigation” of the latest incident with Durham Constabulary and HMP Frankland.
Three prison officers were taken to hospital with serious injuries following the alleged incident.
It was previously reported that Abedi was moved from HMP Frankland after the "attack".
Manchester Arena bomb plotter Hashem Abedi | PA
It was understood at the time that the incident involved makeshift knives and cooking oil.
The Justice Ministry previously said there would be a full, independent review into the alleged incident.
It prompted criticism from survivors and the families of victims of the bombing.
Abedi's older brother Salman killed 22 people and injured more than 1,000 after detonating a home-made device hidden in a rucksack at the end of an Ariana Grande concert on May 22, 2017.
The Glade of Light Memorial dedicated to the memory of those who died at the Manchester Arena bombing in 2017 | PAIn wake of the alleged attack, Shadow Justice Secretary Robert Jenrick said it was "extremely concerning".
"My thoughts are with the officers involved," he said.
"There are serious concerns about the prison leadership's ability to contain the threat from Islamist extremist inmates ... this deeply serious security failure must be a turning point."
Cabinet counterpart Shabana Mahmood said she was "appalled" and her thoughts were with the officers.
"I will be pushing for the strongest possible punishment," she said.
"(Alleged) violence against our staff will never be tolerated."
Reform UK Leader Nigel Farage said "this monster should never have been in a position to (allegedly) hurt our brave prison officers".
"It is worth remembering that this family came to Britain as asylum seekers," he added at the time.
"The system is broken."
Abedi remains in prison and is due to appear at Westminster Magistrates’ Court on September 18.