Disgraced sports doctor Larry Nassar, who was convicted of sexually abusing Olympic and college female gymnasts, was stabbed multiple times by another inmate at a federal prison in Florida that is experiencing staffing shortages.

The attack happened Sunday at United States Penitentiary Coleman, and Nassar was in stable condition on Monday, two people familiar with the matter told The Associated Press.

One of the people said Nassar had been stabbed in the back and in the chest. The two officers guarding the unit where Nassar was held were working mandated overtime shifts because of staffing shortages, one of the people said.

The people were not authorized to publicly discuss details of the attack or the ongoing investigation and spoke to the AP on the condition of anonymity.

Nassar is serving decades in prison for convictions in state and federal courts. He admitted sexually assaulting athletes when he worked at Michigan State University and at Indianapolis-based USA Gymnastics, which trains Olympians. Nassar also pleaded guilty in a separate case to possessing images of child sexual abuse.

The federal Bureau of Prisons has experienced significant staffing shortages in the last few years, an issue thrust into the spotlight in 2019 when the convicted financier Jeffrey Epstein took his own life at a federal jail in New York.

An Associated Press investigation in 2021 revealed nearly one third of federal correctional officer positions were vacant nationwide, forcing prisons to use cooks, teachers, nurses and other workers to guard inmates. The staffing shortages have hampered the response to emergencies at other prisons, including suicides.