Additional police officers were on hand Thursday morning at Morgan County High School after a threatening note was found in a locker.
Two students share the locker where the note was found Wednesday.
As a precaution, all of the lockers in the school were searched Wednesday afternoon.
Thursday morning, students were searched as they arrived at school.
No charges have been filed so far.
The school's principal says if the person responsible is found, he or she will face disciplinary action.
The principal says attendance was lower Thursday.