Firefighters have extinguished a large fire at a cardboard packaging factory in Otara.
Fire service spokesperson Scott Osmond said crews were called to the blaze at Huhtamaki on Bairds Road about 3.15am.
Mr Osmond said the fire started in an oven containing egg cartons. The blaze was contained to the inside of the building, he said.
At the height of the fire, there were 20 trucks at the scene.
Mr Osmond said the fire has been extinguished, however 15 trucks remain onsite.
No one was injured in the blaze, which is not thought to be suspicious.