HARVARD – Students at Crosby Elementary School in Harvard were kept in their classrooms for more than an hour Monday morning after a shell casing was found in the cafeteria, police said.
Members of the Harvard Police Department were called to the school at around 7:45 a.m. for a report of a .22-caliber shell casing being found by maintenance staff on the cafeteria floor, according to a news release.
The students were kept in their classrooms as police and District 50 staff searched the school for any other suspicious items, activity or people, Harvard police Chief Dan Kazy-Garey said. Nothing was found, and the school day later resumed.
Where the shell casing came from has yet to be determined, Kazy-Garey said.
The investigation is ongoing.
Teachers, parents and students made an anxious return to school today after a gunman stormed into Sandy Hook Elementary School in Newtown, Conn., on Friday, shooting to death 26 people before killing himself.
School districts across the U.S. were increasing patrols and reviewing security plans in an effort to ensure students' safety and calm parents' nerves. They were also preparing to handle the psychological toll, keeping guidance counselors on standby and offering teachers advice on how to answer difficult questions from students.
Within the first hours of classes starting Monday there were already reports of schools in several states on lockdown and police officers responding to potentially suspicious incidents.
• The Associated Press contributed to this report