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Detective Sergeant Stan Leishman said police were still looking for the man responsible for the February 2 robbery on Gordon Rd.
The man is described as being about 190cm tall, of solid build and of Maori or Pacific Island descent.
"The offender has threatened staff and customers and taken a quantity of cash before fleeing in a small black coloured car.
"If you know who the man in this picture is, or have any information, please contact Det Sgt Leishman on (03) 471 4800.
"Information can also be passed on anonymously to Crimestoppers on 0800 555 111.''