Saskatoon fire investigators said a construction trailer was deliberately set on fire.
Multiple 911 calls were received by the Saskatoon Fire Department on Tuesday at around 8:55 a.m. CT for the blaze on Cardinal Place.
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Firefighters from three stations arrived to find the trailer engulfed in flames.
The first arriving crew started an initial attack with other crews providing fire suppression.
The blaze was brought under control in four minutes.
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No one was inside the trailer.
Both Saskatoon police and the fire department continue to investigate.