Fire crews arrived on the 2900 block of Longshore Avenue just before 11:30 a.m., and then immediately called for police.
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The fire was in the basement of a row home on the block.
When firefighters put it out, they found evidence that the rental property was being used to grow synthetic marijuana with the use of acetone - a chemical commonly used in nail polish remover.
Police then obtained the proper search warrants.
"The fire ward responded to a fire, which would appear to be a weedy-type substance on the floor in the basement, which was soaked with acetone. And I believe that as a result from spontaneous combustion it caught on fire," an undercover police officer explained.
Fortunately, no one was in the house at the time of the fire.
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Police say they have the name of at least one person of interest, but no arrests have been made.
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