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Former US gymnastics doctor Larry Nassar stabbed in prison: Source

Larry Nassar, a former USA gymnastics team doctor, has been stabbed in prison, a source told ABC News.

Nassar was stabbed six times in the back and neck on Sunday afternoon, according to a source. He has what one source described as "substantial injuries," including what appears to be a collapsed lung.

He is listed in stable condition, according to two sources familiar with the situation.

PHOTO: In this Feb. 5, 2018 file photo Larry Nassar sits in court listening to statements before being sentenced by Judge Janice Cunningham for three counts of criminal sexual assault in Eaton County Circuit Court in Charlotte, Mich. (Scott Olson/Getty Images, FILE)
PHOTO: In this Feb. 5, 2018 file photo Larry Nassar sits in court listening to statements before being sentenced by Judge Janice Cunningham for three counts of criminal sexual assault in Eaton County Circuit Court in Charlotte, Mich. (Scott Olson/Getty Images, FILE)

MORE: With Larry Nassar's sentencing, his accusers share their own powerful words

The Bureau of Prisons confirmed that an inmate was assaulted on Sunday at the United States Penitentiary Coleman II, a high security federal facility in Florida, and said no one else was injured.

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Officials have identified at least one suspect, a fellow inmate, and are looking at evidence including video footage to determine if anyone else was involved, according to a source.

PHOTO: In this Nov. 22, 2017 file photo, Dr. Larry Nassar appears in court for a plea hearing in Lansing, Mich. (Paul Sancya/AP, FILE)
PHOTO: In this Nov. 22, 2017 file photo, Dr. Larry Nassar appears in court for a plea hearing in Lansing, Mich. (Paul Sancya/AP, FILE)

Staff members who were guarding Nassar were working overtime, according to a source briefed on the investigation. The source said this was in part due to staffing shortages at the Bureau of Prisons.

Nassar was housed in a unit with all inmates convicted of sexual assault, according to a source familiar with the situation.

Nassar was convicted of state and federal charges for sexually assaulting members of the USA gymnastics team. He's serving his sentences, which total hundreds of years, at USP Coleman.

Former US gymnastics doctor Larry Nassar stabbed in prison: Source originally appeared on abcnews.go.com