Two police officers were greeting students and staff as they arrived at J.D.S.S. in Hanover Thursday morning.
There has been no word on how much longer police will remain on site at John Diefenbaker Senior School. Hanover police continue to investigate after a threatening note was scrawled on a bathroom wall earlier this week.
The note suggested violence would happen on Thursday.
School officials are communicating with parents to keep them and all students informed.