WAUPUN, Wis. (AP) -- A cellblock at Waupun Correctional Institute was locked down for about five hours after officials say an inmate assaulted a prison officer.
Warden Bill Pollard says the inmate attacked the officer at 7 a.m. Monday while the officer was performing his duties. The injured officer was treated and has since returned to duty.
Prison officials locked down the cellblock where the assault happened while they and the Dodge County sheriff's office investigated.
The inmate, who is serving a 10-year sentence for second-degree homicide, was placed in segregation. Sheriff Todd Nehls says additional charges are pending.
No one else was involved. Officials say all inmates and staff are safe, and the prison is operating normally.