Former US gymnastics doctor

Larry Nassar stabbed in prison

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Larry Nassar

was convicted of sexually assaulting USA gymnastics team members

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Larry Nassar,

a former USA gymnastics team doctor,

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Nassar was stabbed

six times in the back and neck on Sunday afternoon, according to a source

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He has what one source described as

"substantial injuries," including what appears to be a collapsed lung.

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He is listed in stable condition,

according to two sources familiar with the situation

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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

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