MELBOURNE-based arson chemists are on their way to Dimboola to investigate a house fire.
The property, at the corner of Faith Street and Nhill Road, has been declared a crime scene after a fire on Tuesday night.
Police guarded the house overnight Tuesday.
"Country Fire Authority and police investigators will be there throughout the course of the day," Horsham Crime Investigation Unit Detective Senior Constable Neale Roberts said.
The CFA placed an emergency warning on the town about 7.30pm on Tuesday.
District 17 CFA rostered duty officer Ian Day said there were several spot fires.
Embers from the house fire also threatened to spread into neighbouring properties.
"But fire-fighters were able to contain it to the one," Mr Day said.
"We are treating it as potentially an asbestos property, and getting sampling does as per our procedures."
He said the house was unoccupied.
Nine CFA trucks were needed to battle the blaze.
Dimboola residents were warned to stay indoors and close all windows, vents and doors because of potentially toxic smoke.
It was the second crime scene in the fire district in as many days, after a house fire at Jung on Monday revealed a small drug set-up.
Earlier - Tuesday night
FIRE-FIGHTERS have stopped the spread of fire at a home in Dimboola.
The Country Fire Authority placed an emergency warning on the town after the fire started at the intersection of Faith Street and Nhill Road on Tuesday night.
It has since been downgraded to an advice warning.
Embers from the house fire were spotting into neighbouring properties and potentially toxic smoke was being released.
Fire crews and vehicles are still controlling the fire and will be in attendance for some time.
Local streets are currently closed.