HARVARD – A Harvard Junior High School student was charged with disorderly conduct after police said he brought three .30-caliber shell casings to school Wednesday.

Harvard police were called to Crosby Elementary School and Harvard Junior High School at 8:10 a.m. for a report of shell casings found on a bus at the elementary school and in a men’s bathroom at the junior high, according to a news release.

Students at all five Harvard District 50 schools were kept in their classrooms as officials searched the schools. No suspicious items, activity or people were found.