Christchurch Police are looking for the person is this image.
Christchurch Police are investigating the aggravated robbery of Skinny Dairy in Clyde Road yesterday morning.
A man entered the dairy at around 11.15am, armed with a knife.
A police spokesperson says fortunately the staff managed to secure themselves in a back room so were uninjured, but they were nevertheless shaken by the incident.
"The man took an unknown amount of cigarettes and left the store.
"Police would like to hear from anyone who recognises the offender (pictured) or who has any information which could assist our investigation."
If you can help, please call Christchurch Police on 03 363 7400.
Information can also be provided anonymously via Crimestoppers on 0800 555 111.