An unexpected day off for students at Wallaceburg District Secondary School.
The Lambton-Kent District School Board says the high school is closed Friday as Chatham-Kent police investigate a potential threat.
Senior administration says a note was found in the school at the end of the day Thursday.
"Student and staff safety are a top priority for the LKDSB and we follow the direction of local police regarding matters of school safety," said Director Jim Costello in a release.