An Auckland post shop employee was forced to hand over a cash drawer after a robber waved a gun at her this afternoon.

Police are investigating the aggravated robbery, which happened at the Mangere Bridge Post Shop on Coronation Rd around 3.10pm.

"A man entered the store, threatened a staff member with what appeared to be a firearm, and demanded she hand over the cash drawer," Detective Sergeant Steve Williamson said.

The man took the money and fled the scene in a vehicle.

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Nobody was hurt in the incident, Williamson said. Support is being provided to the victim and a number of staff and members of the public who were in the store at the time.

Police have completed a scene examination and are talking to several witnesses.

Williamson asked anyone with information that could help with the investigation to call Counties Manukau Police on 09 2611 321.

Information could also be given anonymously via Crimestoppers on 0800 555 111, he said.