Milwaukee (WISN) -- Explosions were heard and black smoke was seen for miles Thursday morning from a fire at an industrial site on Milwaukee's south side.
Fire crews attribute the explosion sound to tires exploding. Firefighters were called to 924 West Armour Ave. at about 10 a.m. near the Plainfield Curve of the Mitchell Interchange.
An official said four dump trucks were on fire and the make-up of those truck make battling the blaze more difficult. Crews had to use foam -- not water -- to extinguish the blaze.
The cause of the fire remained unknown shortly before midday, but officials were investigating whether it was the work of an arsonist.
No one was injured.
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