Marchesini said the 34-year-old was the woman’s partner, and the father of some of the children.
“There is another person that we have made contact with, in terms from interstate, that is a part of that family as well,” he said.
Marchesini would not speculate on the cause of the fire, and said the investigation would include any previous interactions between police and those involved.
He said the woman was found outside the home, and her partner and the 18-year-old had helped access the house to rescue the children.
Police remained on scene at the property on Thursday, undertaking forensic examinations with the assistance of the homicide squad.
Marchesini said officers were also conducting door-knocks in the neighbourhood, and speaking with family members.
“The first and foremost [priority] is around ensuring their health and wellbeing, providing support and obviously being able to elicit information around what happened,” he said.
The Education Department issued a statement on Wednesday afternoon.
“Our deepest sympathies and thoughts are with all those affected by a devastating house fire in the Toowoomba region that occurred overnight,” it said.
“We understand this tragic event will impact many people throughout the community, and support is being provided to students and staff in the area, with guidance counsellors available for as long as needed.”
Toowoomba Regional Council Mayor Geoff McDonald said: “What has taken place is a tragedy and our thoughts are with family and friends.”
Investigators have urged anyone with information or footage to call Policelink on 13 14 44 or contact Crime Stoppers.
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