A man has been found with a serious head injury after being discovered behind a row of shops in Dumbarton.

Police discovered the 46-year-old man at 4.45am on Saturday behind a row of shops on Glasgow Road following a call from a concerned resident.

He was taken by ambulance to the Royal Alexandra Hospital in Paisley where medical staff describe his injuries as life threatening.

Police say the man was spotted leaving a pub in town in the early hours of Saturday morning and was walking in the direction of Dumbarton East train station.

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."