A man has allegedly blown up his parent's home after an argument with his mother.
The explosion sparked an emergency in Mount Helena in Perth's hills with fire spreading through bush and neighbouring properties.
On Saturday, a 34-year-old faced court, as his parents sifted through the rubble where their family home once stood.
Two large gas cylinders were allegedly set on fire in the car port, flattening the home.
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The house is completely gone with nothing salvageable and photos show the site with just twisted metal.
Police say a 34-year-old man lived at the home with his parents.
At around 6.30pm on Friday he and his mother allegedly had an argument and she left.
Police allege the owner's 34-year-old son set fire to the two-storey home then jumped from the second floor.
He badly cut the back of his head and it's understood he broke his ankle.
Neighbours hundreds of metres away say their homes shook during the explosions.
The arson squad charged the 34-year-old man with criminal damage by fire. He wasn't well enough to attend court on Saturday and had a bedside hearing at Royal Perth Hospital.
He was remanded in custody.