A fire at an industrial bread facility in Perth's south has caused a shortage of sliced bread on supermarket shelves across Western Australia.

Tip Top Bakeries' Canning Vale site has been operating at reduced capacity since the blaze on Wednesday, with the cause of the fire unknown.

A spokesperson for the company said parts of the industrial bread facility continued to function, and bread was being transported into WA daily from South Australia.

"While we anticipate some short-term impact to bread availability in Western Australia over the next few days, our team is working swiftly to restore full operations," the spokesperson said.

To help fill the gap in supply, Perth-based bakehouse Mias Bakery said it had been working "around the clock" to support Tip Top and customers.

"We are tr

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