Police are investigating the aggravated robbery of the New Zealand Postshop in Whangarei yesterday afternoon.

About 5.30pm a man entered the shop on Rathbone Street.

He presented a note demanding money and gestured towards his pants and said he had a firearm.

The teller handed over some cash and the man ran off. He is described as a Maori, aged between 20 and 30 years wearing a dark hoodie, and cap with a red peak.

He was carrying a grey backpack.

Police would like to hear from anyone who witnessed the robbery or has any information relating to it.

Anyone with information can contact Whangarei Police on 09 430 4500 or if they wish to remain anonymous can contact the Crimestoppers organisation on 0800 555 111.

Source: New Zealand Police.