MINNEAPOLIS (AP) — Minnesota’s attorney general on Saturday denounced a prison attack on Derek Chauvin, saying the former Minneapolis police officer convicted of murdering George Floyd should be able to serve his sentence without fear of violence.

A person familiar with the matter told The Associated Press on Friday that Chauvin was stabbed by another inmate at the Federal Correctional Institution, Tucson, a medium-security prison that has been plagued by security lapses and staffing shortages. The person spoke to the AP on condition of anonymity because they were not authorised to publicly discuss the attack.

The person said Chauvin was seriously injured in Friday afternoon’s attack.

On Saturday, Brian Evans, a spokesman for the Minnesota attorney general’s office, said: “We have heard that he is expected to survive.”

The US Bureau of Prisons has confirmed an assault at the facility and said employees performed “life-saving measures” before the inmate was taken to a hospital for further treatment and evaluation. The Bureau of Prisons did not name the victim or provide a medical status “for privacy and safety reasons.”

Prosecutors who successfully pursued a second-degree murder conviction against Chauvin at a jury trial in 2021 expressed dismay that he became the target of violence while in federal custody.

“I am sad to hear that Derek Chauvin was the target of violence. He was duly convicted of his crimes and, like any incarcerated individual, he should be able to serve his sentence without fear of retaliation or violence,” Minnesota Attorney General Keith Ellison said in a statement.

The Bureau of Prisons said no employees at the Tucson facility were injured in the attack and that the FBI was notified. The facility has about 380 inmates.

Terrence Floyd, George Floyd’s brother, told The Associated Press on Saturday that he wouldn’t wish for anyone to be stabbed in prison, and that he felt numb when he initially learned of the news.

“I’m not gonna give my energy towards anything that happens within those four walls — because my energy went towards getting him in those four walls,” Terrence Floyd said. “Whatever happens in those four walls, I don’t really have any feelings about it.”

Chauvin’s stabbing is the second high-profile attack on a federal prisoner in the last five months. In July, disgraced sports doctor Larry Nassar was stabbed by a fellow inmate at a federal penitentiary in Florida.

Chauvin, 47, was sent to FCI Tucson from a maximum-security Minnesota state prison in August 2022 to simultaneously serve a 21-year federal sentence for violating Floyd’s civil rights and a 22½-year state sentence for second-degree murder.

Chauvin’s lawyer, Eric Nelson, had advocated for keeping him out of the general population and away from other inmates, anticipating he’d be a target. In Minnesota, Chauvin was mainly kept in solitary confinement “largely for his own protection,” Nelson wrote in court papers last year.

Last week, the US Supreme Court rejected Chauvin’s appeal of his murder conviction. Separately, Chauvin is making a longshot bid to overturn his federal guilty plea, claiming new evidence shows he didn’t cause Floyd’s death.

Floyd, who was Black, was killed May 25, 2020, after Chauvin, who is white, pressed a knee on his neck for 9½ minutes on the street outside a convenience store where Floyd was suspected of trying to pass a counterfeit $20 bill.

Bystander video captured Floyd’s fading cries of “I can’t breathe.” His death touched off protests worldwide, some of which turned violent, and forced a national reckoning with police brutality and racism.

Three other former officers who were at the scene received lesser state and federal sentences for their roles in Floyd’s death.