The blaze, which started just after 11pm is second for the year after a residential building in Atupa was razed to the ground in February.
Rescue Fire Service chief Willie Hagai said firefighters received a call notifying them of the blaze at about 11.15pm.
He said the service sent their two domestic fire trucks and were joined by two trucks each from Puaikura and Teimurimotia fire stations.
“By the time we arrived to the scene, the fire had already engulfed the building but we managed to keep it under control within its vicinity,” Hagai said.
“Also, people who noticed the fire acted swiftly by removing items such as gas cylinders away from the building.”
The fire completely destroyed the store, but the structure remains standing.
Hagai said they were waiting for fire investigators from Tower Insurance in New Zealand to arrive to look into how the blaze had occured.
“The building is insured and once the investigators from Tower Insurance arrive, we will be able to complete our investigation into this fire,” he said.
“We are not sure when they are arriving but we expect them to be here by next week. It should take a week to complete the investigation, but that all depends on when they arrive on the island.”
Eyewitnesses told CINews that the fire started from the back of the store. There was no-one in the building when the fire started.