A threat against a local high school was determined to be unfounded by Guelph Police. Officers were dispatched to Guelph Collegiate Vocational Institute on Paisley Road just before 1:40 p.m. Thursday, according to a social media post from police. The school was locked down for the duration of the investigation. It was lifted a short time later. In an email to CTV News, police confirmed the lockdown was lifted around 2:20 p.m. They said a threat had been made against the school around 1:10 p.m., but did not say what that threat involved.