Woolston Night 'n Day on Ferry Road has been robbed nine times since August.

Police say they have solved eight of the nine recent Woolston Night 'n Day robberies.

Robbers have hit the 24-hour Christchurch dairy nine times since August last year.

"Eight out of these nine robberies have resulted in 15 arrests, which is a fantastic result and the remaining robbery continues to be an active investigation," Canterbury area prevention manager Acting Inspector Paul Reeves said.

POLICE A man wearing a shark onesie robbed a Rolleston petrol station of some lollies.

"We're working very, very hard to hold offenders to account."

READ MORE:

* Christchurch dairy robbed twice in three days, eighth time in seven months

* Woolston Night 'n Day 24-hour dairy robbed again

* Seven robberies in seven months "extremely concerning"

* Christchurch 24-hour dairy robbed for the sixth time in four months

* Christchurch Night 'n Day robbed for fifth time

* 'Someone's likely to get seriously injured somewhere along the way' – police

He said police staff were providing advice and prevention strategies to retailers.

Police arrested two youths for two service station robberies earlier this month, including one at BP Rolleston while they were disguised in animal onesies.

Both teens had appeared in the Youth Court on charges of aggravated robbery.

Reeves said police also arrested two people last week following a firearms incident.

Nobody was harmed, but local schools had to go into lockdown after a firearm was stolen from a house and the burglar attempted to evade police.

Reeves thanked those who had helped police with their appeals for information about crime, and encouraged others to pass on information, even if it seemed insignificant.

"Even a small piece of information can help us put together a case."

Police are still seeking information about robberies at Harewood Tavern on March 11, Brickworks Bar on March 14 and Trevino's Restaurant on March 24.

Anyone with information can contact their local police station or can report information anonymously by calling Crimestoppers on 0800 555 111.

ROBBERIES AT WOOLSTON NIGHT 'N DAY

- August 20, 2016

- October 1, 2016

- October 20, 2016

- November 23, 2016

- December 3, 2016

- December 22, 2016

- January 3, 2017

- March 5, 2017

- March 8, 2017