Auckland Airport's domestic terminal was evacuated on Sunday morning after an "item of concern" was located in a bathroom.
A police spokeswoman told Newshub the terminal was evacuated as a precaution.
The spokeswoman said the area has been cordoned off while further investigations are carried out.
"Whole place is emptied and we are not allowed to get in," one passenger said on Twitter.
It's understood passengers have since been able to return inside.