A semi-trailer at Bob's Discount Furniture on Blackstone and Pinedale Avenue was reported to have smoke coming from it at about 2:00 am.
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Fire crews do not know how the fire started, but they say about a third of the furniture inside the trailer was damaged.
There was also smoke damage in the loading dock area of the business.
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Firefighters say they'll be looking at surveillance videos to learn how the fire possibly started.