It started around 5:45 a.m. at the Johns Manville facility on the 400 block of North Grove Street.
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The view from Chopper 6 showed smoke billowing from the building, but no flames could be seen.
Multi-alarm fire at Winslow Twp., NJ warehouse
Officials said all occupants were accounted for and no injuries have been reported.
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The cause of the fire has not been determined.
The Johns Manville company manufactures insulation and roofing materials.