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Detectives have accused two men of attempting to murder over the stabbing of infamous underworld figure Tony Mokbel in Victoria's Barwon prison.
Mokbel, 53, remains in critical condition at the hospital after the attack, which took place in Lara's prison, southwest of Melbourne, at.
A 31-year-old inmate was also attacked and taken to Geelong Hospital for treatment before being released from the hospital this morning.
Arbitration crime detectors accuse the two 21-year-old men of attempted murder who intentionally cause serious harm and cause serious injury on purpose in the event of serious violence.
The two men will be shown in Geelong Magistrates' Court for an archive hearing on Friday.
Barwon Prison houses the state's most dangerous offenders and was where gangland killer Carl Williams was bashed to death with part of an exercise bike in 2010.
ABC understands that Mokbel suffered a shock to the chest during the attack before being flown to Royal Melbourne Hospital where he remained in critical condition at. 4:30 am on Tuesday.
Victoria's Correctional Commissioner, Emma Cassar, said that CCTV recordings of the attack showed "beating and stabbing" when two men attacked Mokbel when he returned to his cell from the prison headquarters.
"Tony was definitely beaten unconscious [according to] CCTV. Within seconds, and certainly I can say safe in 10 seconds, the first employee replied, "she told ABC Radio Melbourne.
"They provided medical assistance to Tony Mokbel and quickly secured the two suspects who were taken away."
She said three temporary weapons, known as shivs, were found and handed over to Victoria Police.
The two suspects were separated within the time of the attack and moved into the high security unit of the prison.
Despite the critical condition of Mokbels, Dr Cassar said she did not believe his injuries were "life-threatening".
She said the other prison wounded in the attack seemed to go to Mokbel's help in the shooting.
Mokbel, who was sentenced to 30 years in prison in 2012, was a mastermind behind an elaborate drug syndicate, known as The Company.
He was arrested in Greece in June 2007, 15 months after flying Melbourne while on bail during a cocaine import charge.
Victorian Prime Minister Daniel Andrews said on Tuesday that the government was willing to make the necessary changes to prison security in the wake of the incident.
"It doesn't matter what we feel about that person, we want our prisons to work properly, and that means they must be safe for everyone involved, and that includes staff," Andrews said.
More on the way.