An arsonist may have started a fire that badly damaged an abandoned building in Burlington Saturday evening.
Around 6:15 p.m., fire crews arrived at the former offices of Sun Chemical at Plains Road East and Brant Street.
Heavy smoke and flames prompted emergency workers to evacuate a nearby plaza as a precaution.
A firefighter was treated in hospital for minor injuries and released.
The Ontario Fire Marshal is investigating.
With files from the Canadian Press