The incident happened at Glenmall Place in Glen Eden just before 3pm.
Police are at the scene of an aggravated robbery in West Auckland.
A security guard transporting money to a security van was approached by a man armed with a gun.
The guard was threatened before the gunman made off with an undisclosed amount of cash.
The incident happened at Glenmall Place in Glen Eden just before 3pm.
"The offender has then fled the scene in a silver station wagon, which has since been recovered.''
Police said the security guard involved was not injured in the robbery.
Officers are appealing to members of the public who may have witnessed the incident to come forward.
Authorities are also looking at CCTV footage in the area.
Anyone with information is urged to contact Waitakere Police: (09) 837 9511 or CrimeStoppers anonymous: 0800 555 111.
More to come
The police officer wore the gang patch vest over his police uniform.