Firefighters are battling a large blaze at Owen's Transport in Penrose, Auckland.
An employee at a local business said she could see smoke coming out of the warehouse - she understood the fire was in the company's engineering workshop.
Another man who was nearby, Dylan Martin, said the blaze "sounded like a really loud car backfiring".
"Thick smoke started coming up. It seems to have been dealt with as it's just really smoggy now," Martin said.
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She had seen two fire trucks arrive but could not see flames.
Southdown Lane had been closed, she said.
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