FLORENCE, Colo. - 9Wants to know has confirmed that the inmate investigators say assaulted three staff members at the Supermax prison is behind bars serving a life sentence for killing another inmate at a federal prison in Louisiana.
Ishmael Petty, 44, allegedly attacked the staff members at the United States Penitentiary Administrative Maximum in Florence using a homemade weapon around 7 a.m. Wednesday.
Staff immediately responded and were able to restrain the inmate, according to a Bureau of Prisons news release.
Three staff members were transported to a local hospital for evaluation and treatment of non-life threatening injuries, the release said. Two have been released from the hospital. The condition of the third staff member has not been released.
Supermax houses some of the country's most dangerous inmates, including terrorists.
The FBI is investigating the incident.
Petty pleaded guilty in 1998 to armed bank robbery, using and carrying a firearm during and in relation to a crime of violence and possession of a firearm by a convicted felon.
A grand jury indicted Petty for the Dec. 17, 1997 bank robbery at The Peoples Bank of Okolona, Mississippi, according to federal court records reviewed by 9Wants to Know.
The indictment says Petty had been previously convicted of armed robberies and robbery, meaning he could not carry a gun. Court records do not detail those offenses.
A judge sentenced him to 35 years in prison.
While at the U.S. Penitentiary in Pollock, Louisiana, Petty murdered inmate John MacLeod.
Petty pleaded guilty to second-degree murder in 2002 and was sentenced to life in prison. The judge recommended the Bureau of Prisons send Petty to Supermax.
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