Dane County deputies say 16 school buses had their tires slashed, making them inoperable on the first day of school.
Sheriff's deputies responded to a call Thursday morning of vandalism at the First Student Bus Service in the town of Christiana. They found that 54 tires had been slashed.
The sheriff's office says the estimated cost of the damage is $18,900. Authorities ask that anyone with information come forward.
The buses serve the Cambridge/Deerfield School District.
School superintendents in Cambridge and Deerfield tell the Wisconsin State Journal that most kids were still able to get to school, in part because of helpful parents.
First Student spokesman Timothy Stokes says the buses should be available by Thursday afternoon.