A Victorian woman has died in hospital after a man known to her allegedly set her house alight using a flammable liquid.
Emergency services were called to a fire at a property on Sutherland Street in Albanvale, west of Melbourne, about 5:20pm on Monday.
At the time police said they believed a man ignited a flammable liquid at the home, with others at the address attempting to extinguish the flames.
Firefighters arrived to find the single-story house fully alight, bringing it under control within 30 minutes.
A 36-year-old woman was taken to hospital with critical injuries and died early on Friday morning.
A 17-year-old girl was taken to hospital with serious injuries.
Arson and explosive detectives are investigating the fire, with a 38-year-old man currently under police guard in hospital.
"All parties involved in the incident were known to each other and the fire is being treated as suspicious," Victoria Police said in a statement.
