Bystanders found all four on the side of the road at Valley Heights on Sunday with stabbing injuries
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Police have alleged that a mother was behind a stabbing attack on three young children that left one dead and two others fighting for their lives in hospital.
The woman, aged in her forties, is also in a critical condition.
Support for anyone affected by the subject matter of this report is available at Full Stop Australia (1800 385 578)
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