It happened along the 200 block of Jackson Road in Atco.
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Officials said two very large mulch piles caught fire at a landscaping company.
WATCH: Chopper 6 over mulch fire in Atco, New Jersey
Chopper 6 over mulch fire in Atco, New Jersey
Chopper 6 was over the scene as heavy smoke billowed into the sky.
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There's no immediate word on what sparked the blaze.