An Inquest into the deaths of a mother and daughter at their bungalow in Suffolk has heard evidence that a fire was started deliberately and that the explosion was an unintended consequence of that fire.
The Inquest has heard how flammable liquid was used but it was unclear how a naked flame was introduced.
The fire started in a sunken lounge at the end of the bungalow according to experts.
50-year old Julie Tierney and 78-year old Pamela Tierney were found in Pamela's bedroom lying together on the bed.
Pamela had terminal colon cancer and was nearing the end of her life. Her daughter Julie was her carer.
The Inquest heard how they rarely left the house and were very reclusive.
The date of Pamela's death was confirmed as the 5th of May, two days before the explosion on the 7th May. She died from bowel cancer and was receiving end of life care.
The Inquest continues.
Post mortem examinations had shown that Pamela died of natural causes, and Julie died from breathing in smoke.
Both of the women were pronounced dead at the scene by paramedics and were identified by their dental records.
The inquest is being heard at Suffolk Coroner's Court in Ipswich.
In his narrative conclusion Coroner Nigel Parsley said Pamela had died of a natural progression of an illness whilst on end of life treatment.
Julie died from inhalation of fire fumes after deliberately setting fire to the house and laying down by her mother who had died two days previously.
He said she must have intended her death and the conclusion was therefore death from suicide.