Inmate to be arraigned for Massachusetts prison attack

​An inmate accused of attacking correction officers inside a Massachusetts prison last month is scheduled to be arraigned on Thursday.

Thirty-six-year-old Heriberto Rivera-Negron is one of three inmates accused in the attack at the Souza-Baranowski Correctional Center in Lancaster last month. He is charged with mayhem, armed assault to murder and assault to murder.

One of the correction officers was stabbed up to 12 times in the maximum security prison. Four other correction officers were also hurt.

The other two inmates accused in the attack will be arraigned at a later date.

More on the prison attack

Lancaster Sep 26

Mass. prison attack fallout centers on weapons, ‘secreted contraband'

Lancaster Sep 20

Video of Mass. prison attack released

Massachusetts Sep 19

Correction officer stabbed 12 times by inmates, suffered punctured lung, union head says