An explosion at a North York construction site sent seven workers to hospital Tuesday morning including three with life-threatening injuries.

Firefighters responded to a condominium under construction at 68 Esther Shiner Blvd ., near Leslie Street and Sheppard Avenue, around 9:20 a.m. after reports of a natural gas explosion.

Of those hurt, three suffered life-threatening injuries, three others are facing serious injuries that have been assessed as not life-threatening and a seventh was transported with minor injuries.

First responders initially said nine were taken to hospital and multiple others were injured but later adjusted the number to seven. Andres Valenzuela/Toronto Star The Star

Investigators have not shared what caused the explosion but police said it was being treated

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