Staff and students will be back to work Monday at Wallaceburg District Secondary School.
The school was closed on Friday after a threatening note was discovered on Thursday.
Police and the school board thought it best to play it safe and cancelled classes.
Chatham-Kent police are continuing their investigation but believe this was an isolated incident.
Officers will be at the school again today, and counselors will be on hand to provide support to any students or staff who need it.
