A 16-year-old male from Gravenhurst was arrested and charged with mischief and uttering threats on Friday morning after Trillium Lakelands District School Board received a “generalized threat.”

According to Bracebridge OPP the threat had been made to the board via Twitter triggering a “hold and secure” precautionary measure at every school in the entire board Dec. 9. This meant the schools locked their exterior doors not allowing anyone in or out.

“The tweet was made to the Trillium Lakelands School Board and as a result all Trillium Lakelands Schools both elementary and secondary were put into a ‘hold and secure’ in order to ensure the safety of students while police investigate” a press release from Bracebridege OPP reads.

Around 11 a.m. the school board tweeted the “hold and secure” had been lifted.

Police say there is no threat to school safety but they are asking for any information the public may have. Call Bracebridge OPP at 1-888-310-1122 or Crime Stoppers at 1-800-222-8477.