More than 150 people were evacuated from Palmerston North airport, after threats made this afternoon.
Police and the Defence Force Explosive Ordnance Disposal unit were on the scene.
The threat was made just after 2pm and police said they were still investigating the nature of the threats.
All passenger flights were cancelled, although some freighter flights were continuing.
The people being evacuated - which include airport staff and passengers - are being taken on buses from the terminal to the airport's exit points.
Flights were to restart tomorrow morning.