Three students broke into Paul Laurence Dunbar High School over the weekend and spraypainted graffiti throughout the school.
Fayette County schools spokeswoman Lisa Deffendall said the students spray painted phrases such as "class of 2015" and "we outta here" on the walls, floors and bleachers in the gym.
Custodians found the damage Monday and cleaned it up and painted over it.
Deffendall said the vandals, who wore masks, also spraypainted security cameras, but that surveillance video was available.
"The students involved will face serious disciplinary consequences," she said.