OMAHA, Neb. (AP) — Some Nebraskans are calling for a criminal investigation of the Department of Correctional Services after internal emails showed officials knew sentences were being calculated incorrectly for hundreds of prisoners and didn’t correct the problem.

The Omaha World-Herald reported earlier this week on emails that show corrections officials disregarding a Nebraska Supreme Court ruling last year on mandatory minimum sentences.

Omaha attorney James Martin Davis says the internal emails make it clear the sentences were calculated incorrectly on purpose. That could make it a criminal matter.

Gov. Dave Heineman says a thorough review will be completed by a Lincoln law firm to determine what happened inside the corrections department.

And a legislative committee that was created to investigate a separate case plans to widen its probe to include the sentencing errors.