Milton High School went into “STAY IN PLACE” status at 1 p.m. Tuesday after an unidentified metal object that a student thought may be a bullet casing was found, according School Superintendent Mary C. Gormley.

The student went to the vice principal’s office at approximately 11:20 a.m. to report the object found on the floor of his classroom. An immediate call to Milton police was made and an investigation was then initiated, Gormley said in an e-mail to parents.