A mother has been charged with three counts of murder and three counts of attempted murder after a fire tore through a home in Toowoomba, Queensland, killing three of her children.

Seven people were inside a home in Harristown when a fire broke out about 12.30am on Wednesday, May 7.

A 36-year-old woman and a 34-year-old man, along with four children, escaped the blaze.

A nine-year-old boy is dead and a woman is under police guard after a suspicious house fire in Toowoomba, Queensland. 
Police are investigating whether children were doused with an accelerant before a fire tore through a home. (Nine)

The body of a nine-year-old boy was found inside after firefighters extinguished the blaze.

A four-year-old girl and a seven-year-old girl died at Queensland Children’s Hospital from injuries they sustained in the fire.

A 34-year-old man, an 18-year-old man and an 11-year-old boy escaped from the fire but suffered minor injuries.

The woman, who is understood to be the children’s mother, was taken to the Royal Brisbane and Women’s Hospital under police guard.

She remains in a critical condition.

Police said there was an extensive investigation combining Child Protection Detectives, the Homicide Investigation Unit, and specialist forensic police.

Today, police charged her with three counts of murder (domestic violence), three counts of attempted murder, and one count of arson.

Last week, police said they were investigating whether the children had been doused in an accelerant before the fire tore through the home.

The woman will face court at a later date.

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