Three armed offenders covered from head to toe stole cash and cigarettes from a Christchurch dairy early this morning.
The offenders entered Night 'n Day on Ferry Rd in Woolston about 3.30am with a firearm.
A police spokeswoman said the trio threatened the dairy worker and demanded they open the till. The worker was unharmed.
Police said it was possible the offenders left on bikes.
Anyone who saw anything suspicious or has information is asked to contact Detective James Haigh at Christchurch Police on (03) 363 7400 or anonymously via Crimestoppers on 0800 555 111.