KITCHENER – A Stratford high school was under lockdown while police investigated a gun call on Thursday.

Stratford Northwestern Secondary School was locked down at around 12:45 p.m.

Police say they responded to investigate a person with a gun.

The Avon Maitland District School Board says police were on scene and that the lockdown was lifted at 1:15 p.m.

A spokesperson for the board says the end-of-day dismissal will continue as normal.

Police say two students are in custody. One of them, 17, reportedly had a replica gun.

He's been charged with possession of a weapon for a dangerous purpose.

The other, 14, was arrested for obstructing police. He was lter released from custody without any charges being laid.

They're still investigating.