The Forensic Crash Unit is investigating a serious single-vehicle traffic crash in Logan on Friday, October 4.
Around 12.30am, a silver Holden Commodore was travelling east on Stockleigh Road in Stockleigh when it left the road and crashed into a tree.
The driver of the vehicle, a 23-year-old Park Ridge man, was transported to the Princess Alexandra Hospital with life-threatening-injuries.
The passenger, a 22-year-old Stockleigh man, was transported to the Princess Alexandra Hospital with serious injuries.
Forensic Crash Unit investigations are ongoing and will establish if speed was a contributing factor to the crash.
Investigators are appealing to any witnesses, or anyone with relevant dashcam vision to come forward.
If you have information for police, contact Policelink by providing information using the online suspicious activity form 24hrs per day at www.police.qld.gov.au/reporting or call 131 444.
Report crime information anonymously via Crime Stoppers. Call 1800 333 000 or report online at www.crimestoppersqld.com.au.