COLUMBUS — A newly released video shows the brutality of an Ohio inmate's knife attack on four other prisoners who were handcuffed to a table and unable to defend themselves.

The video obtained by the Associated Press reveals for the first time the extent of the victims' injuries and raises questions about how the bloody attack happened inside the Southern Ohio Correctional Facility in Lucasville, one of Ohio's most secure prisons. Additional security concerns were raised months later when the same prisoner was allegedly involved in a knife attack that left a guard severely injured and hospitalized for months.

Shamieke Pugh was one of the four inmates in the first attack on June 4, 2017.

"He was trying to kill us, for sure," said Pugh, who is now out of prison and recovering from multiple stab wounds in his arm, chest and back. The four prisoners were playing cards during an out-of-cell recreation period.

Pugh, 28, believes guards set up the attack, something the prison system, the guards' union and the prosecutor who brought charges against the attacker strongly deny.

In the video, inmate Greg Reinke is seen stabbing Pugh and three other prisoners multiple times during the assault that could have been even worse had one of the victims not freed himself and fought back. Reinke hid two homemade knives on himself and used one of them — a 7-inch shank — in the assault.

Just under a minute passes before the first guard appears at the end of a long hallway and charges toward the attacker in the video obtained by the AP through an open records request. More than three minutes pass before guards free the last of the inmates from their cuffs chained to a blood-drenched table.

Reinke "stated that he just felt like killing someone," according to a prison report after the attack.

The following day, authorities declined to prosecute Reinke, arguing that he was already serving a life sentence. Reinke was convicted of aggravated murder in a 2004 shooting in Cleveland.

Then, just over eight months later on Feb. 20, Reinke and a second inmate were accused of assaulting guard Matthew Matthias in the prison infirmary. Mathias suffered 32 stab wounds and numerous internal injuries in that attack and has still not returned to work.

Newly elected Scioto County Prosecutor Shane Tieman changed course and charged Reinke with both prison attacks. Reinke has pleaded not guilty.

Authorities haven't determined a motive for the attack on the prisoners, and Tieman said there was no evidence of a racial element. Reinke is white and the four inmates are black. Reinke's attorney declined comment on the video.

Reinke, 38, is now housed in the state's supermax, high-security prison in Youngstown.

The other inmate involved in the attack on the guard, Casey Pigge, was also transferred to Youngstown.