An ANZ Bank in Auckland was robbed at gunpoint this afternoon.

Photo: NZ Police

Police say a man handed a note demanding money to a teller in the West City Mall branch in Henderson, shortly after 2pm.

He lifted his jacket to show a gun in his waistband.

The teller at the bank remained calm and handed over an undisclosed sum and the man ran out of the mall to an underground carpark.

Customers had no idea what had happened.

Before carrying out the robbery, the man spent about ten minutes in the bathroom at the mall.

Police are appealing information about the offender, described as 6-feet tall, clean shaven and 20 to 25-years-old.

He was wearing an olive green jacket with a black hoody underneath, workboots, black pants, a grey beanie and sunglasses.