The Forensic Crash Unit is investigating a serious single-vehicle traffic crash in Redbank overnight.
At approximately 11pm, a vehicle was seen driving dangerously in Redbank Plains.
A short time later, police were called to Chris Street, Redbank where a vehicle had crashed into a parked truck and subsequently caught fire.
Four people were initially trapped but were freed from the vehicle prior to the fire taking hold.
The driver and three passengers sustained serious, but non-life-threatening injuries and were transported to hospital.
Investigators will work to establish if the vehicle is the same as the one seen earlier driving dangerously.
Police are appealing for anyone who may have seen the vehicle in the area at the time, or who may have relevant dash-cam footage, to contact them.
No further information is available at this time.
Investigations are ongoing.