Tucson Firefighters were called out to battle a two-alarm fire at a building north of Downtown.
The fire was reported at around 11:30 a.m. Sunday, at 101 West 6th Street, near Stone Avenue.
Firefighters say a driver was passing by and noticed smoke coming from the building.
It took about 10 minutes to battle the blaze.
Investigators say the sprinkler saved the 105 year old building.
Tucson Fire Captain Jeff Langejans says investigators have determined the fire was intentionally set.
Damage to the building is estimated at $15,000.
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7831 N. Business Park Drive