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Police are investigating whether driver fatigue was a factor in a crash that killed two children and left a one-year-old boy seriously injured in Queensland's south-east.
A family, which included two adults and four children, were in the SUV when it rolled into Wyaralong Dam near Beaudesert south-west of Brisbane yesterday afternoon.
The Land Rover crashed through a guardrail, tumbled into the dam and became submerged on its roof.
The male driver, aged 23, and his female front passenger, aged 33, were able to get out of the car alive after brave passers-by, including off-duty doctors, helped pull them from the wreckage.
They were taken to the Princess Alexandra Hospital with leg injuries and are expected to undergo surgery today.
A one-year-old boy was airlifted to hospital with critical injuries but is now in a stable condition.
A five-week-old infant girl also miraculously survived the crash and is at the Queensland Children's Hospital with no serious injuries.
Tragically, a four-year-old girl and a 13-year-old boy died at the scene.
Police say the family was travelling from Pimpama to Pratten, near Warrick, when the crash occurred on a relatively straight section of road in a 100km/h zone.
"The vehicle appears to have veered to the left and struck a three-strand wire road barrier before travelling across the road onto the opposite side and collided again with the barrier there," Inspector Doug McDonald said.
"The vehicle has subsequently rolled down a stone embankment and came to rest on its roof in a semi-submerged position in the Wyaralong Dam."
The car was removed from the dam last night and will now undergo forensic testing and a mechanical inspection.
Police say investigations into the cause of the crash are still at an early stage.
"Alcohol doesn't appear on initial investigations to be a factor but we keep an open mind in relation to all the fatal five, and in particular, people travelling long distances," Inspector McDonald said.
"Fatigue is a real big killer on our roads, and that's certainly part of our investigation for this matter."
Detectives are appealing for anyone who was travelling along Beaudesert-Boonah Road yesterday around 2pm to come forward.