Two men are fighting for their lives and a woman is in hospital after a car crash near Loch Lomond.
A red Audi TT and a white Volkswagen Tiguan collided on the A811, Old Military Road near Gartocharn, around 9.35pm on Thursday.
Members of the public stopped and attempted to provide help to those hurt in the crash.
The 18-year-old and 20-year-old men in the Audi were taken to Queen Elizabeth University Hospital, where staff describe their condition as critical.
The 45-year-old woman who was in the Volkswagen was also taken to hospital where she is receiving treatment.
Road Policing officers in West Dunbartonshire are appealing for witnesses including anyone who has dashcam video.
Inspector Gill Gardner, from the Dumbarton Road Policing Unit, said: “We’re appealing for anyone who was in the area and witnessed the incident or the vehicles involved to please come forward.
“We are particularly keen to speak with anyone who may have dashcam footage, as this could help us establish the full circumstances which led to this crash.
“I would also extend my thanks to the members of the public who stopped and provided assistance to the occupants of both vehicles”
“If you have any information and haven’t already contacted police, please call 101, quoting incident 3569 of 21 April.”