A 15-year-old student is in custody after threats were allegedly made against Walkerville Collegiate over social media.

Windsor police says a male suspect was arrested shortly before noon Thursday. He's been charged with uttering threats.

They say the school went into lockdown around 10:50 a.m. Thursday morning after a Tweet was sent out over Twitter.

The lockdown has since been lifted and police say there’s no further risk to public safety.