Major Collision Investigation Unit detectives are investigating after a car struck a tree in Mortlake today.
The car was travelling along the Hamilton Highway when it hit a tree near Woodhams Lane shortly before 10am on Monday 4 October.
The female driver was transported by road to hospital with minor injuries.
A 6-year-old boy was airlifted to hospital and is in a critical condition.
A 3-year-old girl was taken to hospital with minor injuries.
Detectives are investigating to determine the cause of the crash.
Any witnesses or anyone with dash cam footage is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au
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