Three people robbed a Christchurch dairy with a hammer and a machete early this morning.

Police said the trio entered the Night 'n Day on Ferry Road in Woolston around 5am armed with weapons.

They brandished the hammer and machete at a staff member before taking off with cigarettes and cash.

Police are working with the staff member involved who is understandably shaken, but uninjured.

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Police are making inquiries into the incident and working to locate the offenders.