Former U.S. gymnastics team physician Larry Nassar reportedly suffered at least 10 stab wounds while serving decades in prison for assaulting more than 250 gymnasts.

A representative from Florida’s Coleman II Penitentiary told AFP Nassar was injured during an altercation and has been hospitalized in stable condition. The stab wounds were six in the chest, two in the neck and two in the back.

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The Federal Bureau of Prisons, for its part, indicated that an inmate was attacked at 2:35 p.m. (6:35 p.m. GMT) Sunday at Coleman II Maximum Security Prison, but would not identify those involved.

The prison’s medical staff quickly intervened to save his life, it added in a statement.

Nassar admitted to sexually assaulting athletes while working at the US Gymnastics Federation, Michigan State University and at a gym in Lansing, in the same state. Among those affected were Olympic gold winners Simone Biles, Aly Raisman and McKayla Maroney.

The doctor was arrested in 2016 following an investigation by Michigan State University police, where Nassar practiced medicine.

A $380 million deal was reached with the federation. Michigan State University reached a $500 million settlement with hundreds of Nassar victims in 2018.