Hazardous materials warning issued for Kwinana Beach over toxic ...

Toxic smoke billowing from a factory fire in Perth's heavy industrial complex has seen authorities issue a hazmat warning for people living in an entire residential suburb.

A warehouse storing agricultural supplies caught ablaze in Kwinana Beach, resulting in potentially dangerous smoke spreading throughout the area.

The fire is burning in Perth's heavy industrial area right on the beach.(ABC News)

More than 40,000 people live in the affected areas which includes several residential hubs in the Kwinana district.

Authorities say people should remain inside, out of the smoke or fumes, with doors and windows closed.

Thick dark smoke was seen billowing from the factory.(ABC News)

Air conditioners should also be switched off.

The wind is pushing the smoke towards suburbia.

The warehouse fire in Kwinana Beach as seen from the ocean. (Supplied: Karen Scott)

Perth is in the grips of yet another summer heatwave, with the temperature reaching 42.6 degrees at the nearby Jandakot weather station at the peak of the day.

Earlier in the day, another bushfire in Perth's southern suburbs burned very close to homes at Spearwood.

Firefighters were called to a blaze in Spearwood on Friday morning.(ABC News: David Weber)

That fire tore through bushland in a road reserve next to the busy Stock Road.

Aerial vision shows the land adjacent to Stock Road completely scorched.(ABC News)

Aerial vision shows the land completely scorched, with the fire butting right up against backyard fences.

Jason Parmenter fights the fire in his backyard in Spearwood.(Supplied: Jason Parmenter)

Visit Emergency WA, call DFES on 133 337, follow DFES on Twitter or listen to ABC Local Radio to stay up to date.