Fort Madison prison guards may have foiled a prison break.
Suspicious items were discovered during a routine check Monday.
Corrections officials say they found a 17-foot rope and a bottle with an unknown substance Monday during a routine search of an upper cell house.
They later discovered a 10-foot rope and another unknown substance.
The Fort Madison prison and clinical care facility are both now under restricted movement Tuesday morning.
That means prisoners will be mostly limited to their cells, including for meals.
The ropes were fashioned with braided sheets, and other items included blankets, gloves and sand paper.
Prison spokesman Fred Scaletta says the materials indicate there may have been plans for an attempt to escape from the penitentiary, but nothing has been reported.
Scaletta says it's unclear when the restriction will be lifted.