A major prank at Norwalk High School Tuesday led to students being dismissed from class early.

When students arrived, there was graffiti throughout the school and the doors to 35 classrooms were glued shut. Students who were supposed to attend class in those rooms were taken to the auditorium and all other students stayed locked down until they were dismissed at 9:45 a.m. Students say the graffiti was filled with profanity and aimed at the senior class. Police are investigating the incident, and school will be back in session Wednesday.