Police are making little headway investigating the armed heist of a banks' day's takings - and are now asking the public to help identify the gunman involved.

A lone man armed with a gun snatched the cash around 2.15 on Friday afternoon from two security officers who had just collected it from a nearby bank on the corner of Darby and Queen Streets in Auckland's CBD.

The gunman got away with a large amount of cash in a stolen vehicle, which was later recovered a short distance away.

Police have posted a picture of a man in a hoodie and want to hear from anyone who can identify him.

They say that may assist the investigation team.

Call the Auckland Crime Squad on 09 302 6557 or call Crimestoppers anonymously on 0800 555 111 if you have any information.