Toowoomba woman in critical condition under police guard after three of her children die in suspicious house fire

A nine-year-old boy is believed to have died in the fire while girls aged four and seven died later in hospital from critical burns

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A mother-of-five is fighting for her life after three of her children died in a horrific house fire.

Police are hopeful the 36-year-old woman's condition will improve, saying they aim to speak to her about the blaze that engulfed the family home west of Brisbane.