A 46-year-old man is in 'life threatening' condition after being found with a serious head injury in Dumbarton.
Police responded to a call from a concerned resident at around 4.45am on Saturday morning.
They found the man seriously injured at the rear of shops on Glasgow Road, close to Dumbarton East train station
Emergency services were contacted and the man was rushed to the Royal Alexandra Hospital in Paisley where medical staff describe his injuries as life threatening.
Officers are conducting a search of the area around Argyle Street to establish the location of the attack.
Detectives are also in the process of gathering up any available CCTV footage for review for any additional information which could assist their enquiries.
Detective Inspector Scott Hamilton, Clydebank CID, said: "At this time we do not know how the man sustained his injuries, however, what we do know from our enquiries is that he left the Stags Head Public House, Glasgow Road, Dumbarton, around 1.20 am.
"He is then seen on CCTV half an hour later, around 1.50 am, walking in the area of Dumbarton East train station, Glasgow Road, Dumbarton.
“The man is described as white, 46 years of age, 5’8 in height, medium build, and was wearing a beige jacket with a hood, grey t-shirt, jeans and navy trainers.
“It is essential that we trace his movements from leaving the pub at 1.20 am to him being found on Saturday morning around 4.30 am.
"So, I would ask anyone who may have seen a man fitting his description between those times on Saturday morning to contact the police."
Any information can be passed to officers at Clydebank Police Office via 101. Please quote reference number 0823 of the 1 June 2019 when calling.
Crimestoppers can also be contacted in confidence on 0800 555 111.
