Police have said they believe a house fire which killed three people in Bolton, Greater Manchester was started after the gas supply was tampered with.
Earlier this week they said they were treating the blaze as suspicious.
It is understood one line of inquiry was that Hassan Rafie, 49, had unlawfully killed his wife before deliberately setting the fire.
Neighbours spoke of hearing an explosion from the kitchen of home shortly before flames spread throughout the property.
More top news
The announcement was hailed as a "momentous step" that will help families facing financial stress as they come to terms with their loss.
Pop Idol's Michelle McManus has joined 10 choirs to record a charity single that they hope will make Christmas Number One.
The decision was met with outrage and anger by UK cities which were on the shortlist for the prestigious award.