Queensland police are investigating the sudden death of a 3-year-old girl at Cambooya, near Toowoomba overnight.
The toddler was located deceased at a house on the New England Highway near Greenmount-Etonvale Road around 8.20pm.
Detectives say a post mortem will be carried out tomorrow to determine the cause of death.
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A 36-year-old woman, 71-year-old man and 65-year-old woman present on the property at the time have been spoken to by police.
Investigations by detectives are continuing.