BURLINGTON, N.C. (WGHP) — A North Carolina school district is investigating a “senior prank” at Williams High School in Burlington — which caused over $4,000 in damages.

The school system said students “gained entry” overnight and poured cement into the toilets and urinals.

According to Alamance-Burlington School System, Williams was not its only school that suffered damages, either.

Maintenance crews are cleaning up overturned desks, damaged lockers, graffiti, eggs and trash at several other high schools. Other acts of vandalism were also reported across the district.

“We believe in celebrating milestones in a responsible and respectful way, without crossing the line and causing harm or damage,” ABSS said in a statement.

The district said students involved in the vandalism face potential suspensions and legal charges. Any seniors who were involved will be forbidden from participating in graduation ceremonies.