Larry Nassar, the disgraced doctor of USA Gymnastics who was convicted of sexually abusing young female gymnasts, has been stabbed multiple times by another inmate in prison and was in stable condition on Monday, U.S. media reported.

The Federal Bureau of Prisons confirmed that an inmate at the U.S. Penitentiary Coleman in Florida was assaulted on Sunday afternoon, but declined to identify the prisoner over privacy and security concerns.

Former USA Gymnastics doctor Larry Nassar was assaulted during an incident at the federal prison where he is housed in Florida, according to two sources familiar with the incident.

Joe Rojas, president of the local correction officers’ union, tells CNN that Nassar was stabbed a total of 10 times, twice in the neck, twice in the back, and six times in the chest. Rojas credits corrections officers on the scene with saving Nassar’s life. Rojas says Nassar is in stable condition.

Women who say they were sexually assaulted by a disgraced US national gymnastics team doctor plan to sue the FBI for $1bn (£800m).

Claimants say the FBI mishandled credible complaints of sexual assaults by Larry Nassar.

They include Olympic gymnastics gold medallists Simone Biles, Aly Raisman and McKayla Maroney.

Nassar is serving up to 175 years in prison for molesting gymnasts.

The agency's own watchdog found the FBI disregarded allegations about Nassar and made early errors in its investigation.

More than 90 women and girls, including the star gymnasts who raised concerns about Larry Nassar in 2015 that were disregarded by the Federal Bureau of Investigation, filed administrative tort claims against the agency on Wednesday collectively seeking $1 billion.

The claimants include Simone Biles, McKayla Maroney, Maggie Nichols and Aly Raisman, the elite gymnasts who were first identified in the summer of 2015 as having been sexually abused by the then-doctor to the national women’s gymnastics team under the guise of medical treatment.

Hundreds of female gymnasts who were sexually abused by Lawrence G. Nassar, the former team doctor of the national gymnastics team, have agreed to a $380 million settlement with U.S.A. Gymnastics and the United States Olympic & Paralympic Committee, ending the latest dark chapter in one of the biggest molestation cases in sports history.