"Given the size and nature of supermarkets, rodents can enter and leave them from time to time."
A minimum level has been imposed to try and preserve some of the fish stocks, and farmers' irrigation is restricted to just 25 percent.
The store will reopen on Friday if all things go to plan.
"It is clear we have more work to do."
A second person is seriously injured.
Residents said it's a quiet neighbourhood with young families.
Police said they were called to a two-vehicle crash on Oamaru-Alma Road (State Highway 1).
The public can expect to see an increased police presence in the area.
A photo taken in November that emerged on Friday is just a glimpse of what staff said was a rodent infestation.
