The Lambton Kent District School Board (LKDSB) says a threatening message was found at Sir John Moore Community School on Tuesday.
Lambton OPP were called to the Corunna school and conducted an investigation.
The board issued a news release late Tuesday afternoon.
"It was deemed that there is no immediate threat to student or staff safety at this time," read the statement. "However, as a precaution, enhanced safety measures have been put in place, including police presence and on-site presence of LKDSB’s System Coordinator for Safe Schools."
The LKDSB said they, along with police, will continue to work closely together to ensure a safe learning environment for all.
Anyone with further information about the incident is asked to contact the LKDSB or Lambton OPP directly.
Sarnia News Today has reached out to Lambton OPP for more information.