A masked machete-wielding robber struck at a small Porirua store this afternoon.

But the man made off with only a "small amount of cash", police say.

He walked into Discount T, a tobacco store on Serlby Place, shortly before 3pm today, brandishing a machete at staff.

Nobody was injured in the robbery.

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The man was wearing a light-grey hooded jacket, light-coloured pants and red shoes. He wore sunglasses and masked his face.

Anyone with information can call Wellington police on 04 381 2000 or Crimestoppers on 0800 555 111.