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Emergency crews were alerted at 11.47am.
Northern fire communications shift manager, Colin Underwood, said it is thought there was a fire inside a plant room inside the terminal which resulted in smoke being seen inside part of the terminal.
"The smoke is dissipating now,'' he said.
Underwood said six fire crews remained on site.
A spokeswoman for Auckland Airport said airport emergency services and Fire and Emergency NZ staff were investigating the "sighting of smoke at the international airport''.
The incident had not led to any disruptions or cancellations of flights, she said, and no one had to be evacuated.
St John said they were notified by FENZ of an incident at Ray Emery Dr at 11.50am. However, they were not required.