Police are investigating another fire at an Auckland Countdown which closed the supermarket for half a day.
Emergency services were notified of the fire breaking out at Countdown Botany Downs just after 7.30pm last night.
The store was closed till 12pm, a worker in a neighbouring shop told the Herald.
Police say they are following actives lines of inquiry, including CCTV footage.
A Countdown spokesperson said the supermarket was cooperating with authorities.