Police in Niagara Region say they’re investigating an explosion at a school that injured a female staff member.

Investigators say they were called to Central French Immersion Public School in Grimsby around 1:30 p.m. Wednesday and found there was an explosion in an outdoor garbage bin area.

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The Niagara Regional Police Service says the explosion happened as a school staff member accessed the garbage bin.

They say the staff member suffered minor injuries and was taken to hospital.

Police say the school was placed under a “lock and learn,” while nearby residents were asked to shelter in place.

A police explosives unit has been called to the scene and several roads in the area are closed to traffic.

Investigators are urging the public to stay out of the area.