CARY — Vandals spray-painted graffiti on more than a dozen school buses parked at Green Hope High School over the weekend, but the district was able to get them cleaned up before they set out Monday morning.

The painting appeared to be simple vandalism and not intended to convey any message, according to Cary police. The vandalism was discovered at 4 p.m. Sunday. Police said 19 buses were damaged, but the school system’s reports indicate it was 16, said Wake County schools spokeswoman Cris Mulder.

Mulder said an assistant principal reported the incident to district transportation officials, and six mechanics were dispatched to the school at 2500 Carpenter Upchurch Road at 5 a.m. Monday to help two on-campus mechanics use paint thinner to removed the paint.

Most of the buses are run routes for Green Hope High School and Green Hope Elementary School students, though some are shared with Apex schools.

Some high school routes ran late Monday morning because of the work being done, Mulder said, but the buses were all back on schedule by the time elementary school students were picked up.

Police said they had no immediate suspects.